Selected policy dropdown does not populate without an id

The following discussion from !147307 (merged) should be addressed:

• @arfedoro started a discussion: (+1 comment)

  question (non-blocking) ❓

  If I remove project id in yaml mode, there is weird border color difference:

  borders.mov

  What do you think about making style consistent? follow-up is also possible

Summary

• when a user removes the id from the yaml, the selected policies dropdown does not populate

How to reproduce

1. Upload a GitLab Ultimate license
2. Enable the feature flag echo "Feature.enable(:compliance_pipeline_in_policies)" | rails c.
3. Navigate to a project => Secure => Policies => New policy => Scan Execution Policy
4. Add a new action => Run CI/CD code => Run Linked existing CI file
5. Select a project
6. Navigate to yaml mode and from the recently added id
7. Navigate to rule mode

How to fix

• frontend