Ability to continuously re-run verification or have verification automatically re-run before promotion

[jwoods06]

Checklist

• [X] I've searched the issue queue to verify this is not a duplicate feature request.
• [ ] I've pasted the output of kargo version, if applicable.
• [ ] I've pasted logs, if applicable.

Proposed Feature

Ability to continuously re-run verification or have verification automatically re-run before promotion.

Motivation

There are times when a verification needs to be re-run right before promotion to ensure that nothing has changed. This verification can be done manually or setup to be run continuously as needed.

[aryasoni98]

@jwoods06 I’m happy to work on this! Could you please assign the issue to me?

[krancour]

Related to #5144

[krancour]

@aryasoni98 this is a complex issue requiring discussion and design work. Please let maintainers handle this for now.