Remove sync-metadata and IS_WORKSPACE_CREATION_V2_ENABLED feature flag (#16997)

# Introduction
Followup of
https://github.com/twentyhq/twenty/pull/17001#pullrequestreview-3638508738
close https://github.com/twentyhq/core-team-issues/issues/1910

We've completely decom the `sync-metadata` in production. We're now then
removing its implementation in favor of the v2.

## TODO:
- [x] Remove sync-metadata implem and commands
- [x] Remove workspace decorators 
- [x] Type each deprecated field to deprecated on their workspaceEntity
- [x] Remove the `workspace-sync-metadata` folder entirely
- [x] remove workspace migration
- [x] workspace migration removal migration
- [x] remove the `v2` references from workspace manager file names
- [x] remove the `v2` references from workspace manager modules
- [ ] Double check impact on translation file path updates


## Note
- Removed the gate logic
- Remains some service v2 naming, serverless needs to be migrated on v2
fully
- Removed workspaceMigration service app health consumption, making it
always returning up ( no more down ) cc @FelixMalfait ( quite obsolete
health check now, will require complete refactor once we introduce inter
app dependency etc )

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/handle-enum-flat-field-metadata-update-side-effects.util.ts

@@ -11,7 +11,7 @@ import {
   type FlatViewGroupsToDeleteUpdateAndCreate,
   recomputeViewGroupsOnFlatFieldMetadataOptionsUpdate,
 } from 'src/engine/metadata-modules/flat-field-metadata/utils/recompute-view-groups-on-flat-field-metadata-options-update.util';
-import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration-v2/types/property-update.type';
+import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration/types/property-update.type';
 
 type HandleEnumFlatFieldMetadataOptionsUpdateSideEffectsArgs = FromTo<
   FlatFieldMetadata<EnumFieldMetadataType>,

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/handle-label-identifier-changes-during-field-update.util.ts

@@ -10,8 +10,8 @@ import { findManyFlatEntityByIdInFlatEntityMapsOrThrow } from 'src/engine/metada
 import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { type FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
 import { SEARCH_VECTOR_FIELD } from 'src/engine/metadata-modules/search-field-metadata/constants/search-vector-field.constants';
-import { getTsVectorColumnExpressionFromFields } from 'src/engine/workspace-manager/workspace-sync-metadata/utils/get-ts-vector-column-expression.util';
-import { type SearchableFieldType } from 'src/engine/workspace-manager/workspace-sync-metadata/utils/is-searchable-field.util';
+import { getTsVectorColumnExpressionFromFields } from 'src/engine/workspace-manager/utils/get-ts-vector-column-expression.util';
+import { type SearchableFieldType } from 'src/engine/workspace-manager/utils/is-searchable-field.util';
 
 type HandleLabelIdentifierChangesDuringFieldUpdateArgs = {
   flatObjectMetadata: FlatObjectMetadata;

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/recompute-view-filters-on-flat-field-metadata-options-update.util.ts

@@ -11,7 +11,7 @@ import { findManyFlatEntityByIdInFlatEntityMapsOrThrow } from 'src/engine/metada
 import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { compareTwoFlatFieldMetadataEnumOptions } from 'src/engine/metadata-modules/flat-field-metadata/utils/compare-two-flat-field-metadata-enum-options.util';
 import { type FlatViewFilter } from 'src/engine/metadata-modules/flat-view-filter/types/flat-view-filter.type';
-import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration-v2/types/property-update.type';
+import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration/types/property-update.type';
 
 type RecomputeViewFiltersOnFlatFieldMetadataOptionsUpdateArgs = {
   fromFlatFieldMetadata: FlatFieldMetadata<EnumFieldMetadataType>;

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/recompute-view-groups-on-flat-field-metadata-options-update.util.ts

@@ -13,7 +13,7 @@ import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-m
 import { compareTwoFlatFieldMetadataEnumOptions } from 'src/engine/metadata-modules/flat-field-metadata/utils/compare-two-flat-field-metadata-enum-options.util';
 import { type FlatViewGroup } from 'src/engine/metadata-modules/flat-view-group/types/flat-view-group.type';
 import { reduceFlatViewGroupsByViewId } from 'src/engine/metadata-modules/flat-view-group/utils/reduce-flat-view-groups-by-view-id.util';
-import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration-v2/types/property-update.type';
+import { type PropertyUpdate } from 'src/engine/workspace-manager/workspace-migration/types/property-update.type';
 
 type RecomputeViewGroupsOnFlatFieldMetadataOptionsUpdateArgs = {
   fromFlatFieldMetadata: FlatFieldMetadata<EnumFieldMetadataType>;

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/throw-on-field-input-transpilations-error.util.ts

@@ -2,8 +2,8 @@ import {
   type FieldInputTranspilationResult,
   type SuccessfulFieldInputTranspilation,
 } from 'src/engine/metadata-modules/flat-field-metadata/types/field-input-transpilation-result.type';
-import { EMPTY_ORCHESTRATOR_FAILURE_REPORT } from 'src/engine/workspace-manager/workspace-migration-v2/constant/empty-orchestrator-failure-report.constant';
-import { WorkspaceMigrationBuilderExceptionV2 } from 'src/engine/workspace-manager/workspace-migration-v2/exceptions/workspace-migration-builder-exception-v2';
+import { EMPTY_ORCHESTRATOR_FAILURE_REPORT } from 'src/engine/workspace-manager/workspace-migration/constant/empty-orchestrator-failure-report.constant';
+import { WorkspaceMigrationBuilderException } from 'src/engine/workspace-manager/workspace-migration/exceptions/workspace-migration-builder-exception';
 
 // This could be improved by still running the build and validate with available valid inputs
 type ThrowOnFieldInputTranspilationsErrorArgs = <T>(
@@ -21,8 +21,8 @@ export const throwOnFieldInputTranspilationsError: ThrowOnFieldInputTranspilatio
     );
 
     if (failedInputTranspilationErrors.length > 0) {
-      // We should create a dedicated exceptions instead of hacking through the WorkspaceMigrationBuilderExceptionV2
-      throw new WorkspaceMigrationBuilderExceptionV2(
+      // We should create a dedicated exceptions instead of hacking through the WorkspaceMigrationBuilderException
+      throw new WorkspaceMigrationBuilderException(
         {
           report: {
             ...EMPTY_ORCHESTRATOR_FAILURE_REPORT(),