fix workspace-member deletion with existing attachments/documents (#5232)

## Context
We have a non-nullable constraint on authorId in attachments and
documents, until we have soft-deletion we need to handle deletion of
workspace-members and their attachments/documents.
This PR introduces pre-hooks to deleteOne/deleteMany
This is called when a user deletes a workspace-member from the members
page

Next: needs to be done on user level as well. This is called when users
try to delete their own accounts. I've seen other issues such as
re-creating a user with a previously used email failing.

packages/twenty-server/src/modules/activity/repositories/comment.repository.ts

@@ -0,0 +1,21 @@
+import { Injectable } from '@nestjs/common';
+
+import { WorkspaceDataSourceService } from 'src/engine/workspace-datasource/workspace-datasource.service';
+
+@Injectable()
+export class CommentRepository {
+  constructor(
+    private readonly workspaceDataSourceService: WorkspaceDataSourceService,
+  ) {}
+
+  async deleteByAuthorId(authorId: string, workspaceId: string): Promise<void> {
+    const dataSourceSchema =
+      this.workspaceDataSourceService.getSchemaName(workspaceId);
+
+    await this.workspaceDataSourceService.executeRawQuery(
+      `DELETE FROM ${dataSourceSchema}."comment" WHERE "authorId" = $1`,
+      [authorId],
+      workspaceId,
+    );
+  }
+}