Add 1-21 upgrade command to backfill datasource to workspace table (#19180)

## Summary
- Adds a new `upgrade:1-21:backfill-datasource-to-workspace` command
that copies `dataSource.schema` into `workspace.databaseSchema` for all
active/suspended workspaces that haven't been migrated yet
- Registers the command in the 1-21 upgrade module and wires it into the
upgrade runner (runs before other 1-21 commands)
- Part of the ongoing deprecation of the `dataSource` table in favor of
storing `databaseSchema` directly on `WorkspaceEntity`

packages/twenty-server/src/database/commands/upgrade-version-command/upgrade.command.ts

@@ -12,6 +12,7 @@ import {
 import { CoreMigrationRunnerService } from 'src/database/commands/core-migration-runner/services/core-migration-runner.service';
 import { BackfillCommandMenuItemsCommand } from 'src/database/commands/upgrade-version-command/1-20/1-20-backfill-command-menu-items.command';
 import { BackfillNavigationMenuItemTypeCommand } from 'src/database/commands/upgrade-version-command/1-20/1-20-backfill-navigation-menu-item-type.command';
+import { BackfillDatasourceToWorkspaceCommand } from 'src/database/commands/upgrade-version-command/1-21/1-21-backfill-datasource-to-workspace.command';
 import { BackfillPageLayoutsAndFieldsWidgetViewFieldsCommand } from 'src/database/commands/upgrade-version-command/1-21/1-21-backfill-page-layouts-and-fields-widget-view-fields.command';
 import { IdentifyFieldPermissionMetadataCommand } from 'src/database/commands/upgrade-version-command/1-20/1-20-identify-field-permission-metadata.command';
 import { BackfillSelectFieldOptionIdsCommand } from 'src/database/commands/upgrade-version-command/1-20/1-20-backfill-select-field-option-ids.command';
@@ -68,6 +69,7 @@ export class UpgradeCommand extends UpgradeCommandRunner {
     protected readonly makeWorkflowSearchableCommand: MakeWorkflowSearchableCommand,
 
     // 1.21 Commands
+    protected readonly backfillDatasourceToWorkspaceCommand: BackfillDatasourceToWorkspaceCommand,
     protected readonly backfillPageLayoutsAndFieldsWidgetViewFieldsCommand: BackfillPageLayoutsAndFieldsWidgetViewFieldsCommand,
   ) {
     super(
@@ -102,6 +104,7 @@ export class UpgradeCommand extends UpgradeCommandRunner {
     ];
 
     const commands_1210: VersionCommands = [
+      this.backfillDatasourceToWorkspaceCommand,
       this.backfillPageLayoutsAndFieldsWidgetViewFieldsCommand,
     ];