Implement Run & Delete scan actions

What does this MR do?

Related to #295247 (closed)

Implements the Run scan and Delete DAST profile actions.

Screenshots (strongly suggested)

How to test this?

1. Enable the :dast_saved_scans feature flag.

echo "Feature.enable(:dast_saved_scans)" | rails c

2. Navigate to the DAST scans management page at /:namespace/:project/-/security/configuration/dast_profiles
3. You should be able to run a scan by clicking on the Run scan button.
4. You should be able to delete a profile by opening the actions dropdown and clicking on Delete.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry The changes are behind feature flag
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #295247 (closed)