fix(form deployment): fix failing to deploy after initial failure

[duvld]

🗒️ Checklist

1. run linter locally
2. update all related docs (API, README, inline, etc.), if any
3. draft PR with a title <type>(<scope>)<!>: <title> TASK-1234
4. tag PR: at least frontend or backend unless it's global
5. fill in the template below and delete template comments
6. review thyself: read the diff and repro the preview as written
7. open PR & confirm that CI passes
8. request reviewers, if needed
9. delete this section before merging

📣 Summary

Fixes an issue where a form will not deploy if it fails one time already.

📖 Description

Connecting to openrosa needed to be wrapped in an atomic transaction.

👀 Preview steps

Feature/no-change template:

1. ℹ️ have account and a new project
2. make the project fail to deploy (add 1/0 inside connect() in openrosa_backend.py
3. deploy the form (it fails)
4. remove the 1/0
5. deploy form again (should deploy normally)

See https://www.notion.so/kobotoolbox/Library-locked-form-cannot-be-deployed-1527e515f654806ab4f9c4d42a59ac52

[notion-workspace]

Create unit tests for long-running migration

[notion-workspace]

Library locked form cannot be deployed