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/database/commands/upgrade-version-command/1-13/1-13-migrate-standard-invalid-entities.command.ts

@@ -30,7 +30,7 @@ import {
   MESSAGE_PARTICIPANT_STANDARD_FIELD_IDS,
   MESSAGE_STANDARD_FIELD_IDS,
   WORKSPACE_MEMBER_STANDARD_FIELD_IDS,
-} from 'src/engine/workspace-manager/workspace-sync-metadata/constants/standard-field-ids';
+} from 'src/engine/workspace-manager/workspace-migration/constant/standard-field-ids';
 
 const findStandardFlatObjectMetadataOrThrow = ({
   flatObjectMetadataMaps,

packages/twenty-server/src/database/commands/upgrade-version-command/1-13/1-13-migrate-timeline-activity-to-morph-relations.command.ts

@@ -17,7 +17,7 @@ import { GlobalWorkspaceOrmManager } from 'src/engine/twenty-orm/global-workspac
 import { WorkspaceCacheStorageService } from 'src/engine/workspace-cache-storage/workspace-cache-storage.service';
 import { WorkspaceCacheService } from 'src/engine/workspace-cache/services/workspace-cache.service';
 import { getWorkspaceSchemaName } from 'src/engine/workspace-datasource/utils/get-workspace-schema-name.util';
-import { TIMELINE_ACTIVITY_STANDARD_FIELD_IDS } from 'src/engine/workspace-manager/workspace-sync-metadata/constants/standard-field-ids';
+import { TIMELINE_ACTIVITY_STANDARD_FIELD_IDS } from 'src/engine/workspace-manager/workspace-migration/constant/standard-field-ids';
 import { buildTimelineActivityRelatedMorphFieldMetadataName } from 'src/modules/timeline/utils/timeline-activity-related-morph-field-metadata-name-builder.util';
 
 @Command({

packages/twenty-server/src/database/commands/upgrade-version-command/1-14/1-14-update-created-by-enum.command.ts

@@ -2,19 +2,19 @@ import { Logger } from '@nestjs/common';
 import { InjectDataSource, InjectRepository } from '@nestjs/typeorm';
 
 import { Command } from 'nest-commander';
+import { FieldMetadataType } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 import { DataSource, Repository } from 'typeorm';
-import { FieldMetadataType } from 'twenty-shared/types';
 
 import { ActiveOrSuspendedWorkspacesMigrationCommandRunner } from 'src/database/commands/command-runners/active-or-suspended-workspaces-migration.command-runner';
 import { RunOnWorkspaceArgs } from 'src/database/commands/command-runners/workspaces-migration.command-runner';
 import { WorkspaceEntity } from 'src/engine/core-modules/workspace/workspace.entity';
 import { DataSourceService } from 'src/engine/metadata-modules/data-source/data-source.service';
-import { GlobalWorkspaceOrmManager } from 'src/engine/twenty-orm/global-workspace-datasource/global-workspace-orm.manager';
-import { getWorkspaceSchemaName } from 'src/engine/workspace-datasource/utils/get-workspace-schema-name.util';
 import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { GlobalWorkspaceOrmManager } from 'src/engine/twenty-orm/global-workspace-datasource/global-workspace-orm.manager';
 import { computeTableName } from 'src/engine/utils/compute-table-name.util';
-import { computePostgresEnumName } from 'src/engine/workspace-manager/workspace-migration-runner/utils/compute-postgres-enum-name.util';
+import { getWorkspaceSchemaName } from 'src/engine/workspace-datasource/utils/get-workspace-schema-name.util';
+import { computePostgresEnumName } from 'src/engine/workspace-manager/workspace-migration/utils/compute-postgres-enum-name.util';
 
 @Command({
   name: 'upgrade:1-14:udpate-created-by-enum',

packages/twenty-server/src/database/commands/upgrade-version-command/1-15/1-15-backfill-updated-by-field.command.ts

@@ -30,7 +30,7 @@ import {
   TASK_STANDARD_FIELD_IDS,
   WORKFLOW_RUN_STANDARD_FIELD_IDS,
   WORKFLOW_STANDARD_FIELD_IDS,
-} from 'src/engine/workspace-manager/workspace-sync-metadata/constants/standard-field-ids';
+} from 'src/engine/workspace-manager/workspace-migration/constant/standard-field-ids';
 
 @Command({
   name: 'upgrade:1-15:backfill-updated-by-field',