fix: data migrations for page versioning (#5100)

* dev: remove issue type back migrations

* dev: revert data migrations

* dev: update migrations to run async

* dev: remove unused imports

apiserver/plane/db/backfills/backfill_0070_page_versions.py

@@ -0,0 +1,63 @@
+# Third party imports
+from celery import shared_task
+
+# Django imports
+from django.utils import timezone
+
+# Module imports
+from plane.db.models import PageVersion, IssueType, Issue
+
+
+@shared_task
+def backfill_issue_type_task(projects):
+    # Create the issue types for all projects
+    IssueType.objects.bulk_create(
+        [
+            IssueType(
+                name="Task",
+                description="A task that needs to be completed.",
+                project_id=project["id"],
+                workspace_id=project["workspace_id"],
+            )
+            for project in projects
+        ],
+        batch_size=1000,
+    )
+
+    # Update the issue type for all existing issues
+    issue_types = {
+        str(issue_type["project_id"]): str(issue_type["id"])
+        for issue_type in IssueType.objects.filter(
+            project_id__in=[project["id"] for project in projects]
+        ).values("id", "project_id")
+    }
+    # Update the issue type for all existing issues
+    bulk_issues = []
+    for issue in Issue.objects.filter(
+        project_id__in=[project["id"] for project in projects]
+    ):
+        issue.type_id = issue_types[str(issue.project_id)]
+        bulk_issues.append(issue)
+
+    # Update the issue type for all existing issues
+    Issue.objects.bulk_update(bulk_issues, ["type_id"], batch_size=1000)
+
+
+@shared_task
+def backfill_page_versions_task(pages):
+    # Create the page versions for all pages
+    PageVersion.objects.bulk_create(
+        [
+            PageVersion(
+                page_id=page["id"],
+                workspace_id=page["workspace_id"],
+                last_saved_at=timezone.now(),
+                owned_by_id=page["owned_by_id"],
+                description_binary=page["description_binary"],
+                description_html=page["description_html"],
+                description_stripped=page["description_stripped"],
+            )
+            for page in pages
+        ],
+        batch_size=1000,
+    )