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/view/tools/view-tools.factory.ts

@@ -9,7 +9,7 @@ import { ViewType } from 'src/engine/metadata-modules/view/enums/view-type.enum'
 import { ViewVisibility } from 'src/engine/metadata-modules/view/enums/view-visibility.enum';
 import { ViewQueryParamsService } from 'src/engine/metadata-modules/view/services/view-query-params.service';
 import { ViewService } from 'src/engine/metadata-modules/view/services/view.service';
-import { WorkspaceMigrationBuilderExceptionV2 } from 'src/engine/workspace-manager/workspace-migration-v2/exceptions/workspace-migration-builder-exception-v2';
+import { WorkspaceMigrationBuilderException } from 'src/engine/workspace-manager/workspace-migration/exceptions/workspace-migration-builder-exception';
 
 const GetViewsInputSchema = z.object({
   objectNameSingular: z
@@ -203,7 +203,7 @@ export class ViewToolsFactory {
               visibility: view.visibility,
             };
           } catch (error) {
-            if (error instanceof WorkspaceMigrationBuilderExceptionV2) {
+            if (error instanceof WorkspaceMigrationBuilderException) {
               throw new Error(formatValidationErrors(error));
             }
             throw error;
@@ -255,7 +255,7 @@ export class ViewToolsFactory {
               visibility: view.visibility,
             };
           } catch (error) {
-            if (error instanceof WorkspaceMigrationBuilderExceptionV2) {
+            if (error instanceof WorkspaceMigrationBuilderException) {
               throw new Error(formatValidationErrors(error));
             }
             throw error;
@@ -294,7 +294,7 @@ export class ViewToolsFactory {
               deleted: true,
             };
           } catch (error) {
-            if (error instanceof WorkspaceMigrationBuilderExceptionV2) {
+            if (error instanceof WorkspaceMigrationBuilderException) {
               throw new Error(formatValidationErrors(error));
             }
             throw error;