Add update project selection for scan execution policy action

Why are we doing this work

To create a scan execution policy that links a configuration file, the project is required, but the user does not know that when creating it

Relevant links

!140292 (comment 1705552094)

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

• add tooltip to project selection
• update preselected text if a project is not selected
• add tooltip over ref selector saying how if not selected it will fallback to the default branch

Verification steps

1. Upload a GitLab Ultimate license
2. Navigate to a project => Secure => Policies => New policy => Scan Execution
3. Click Add new action => Run CI/CD code => Run Linked existing CI file
4. Select a project
5. Select a ref