Fix updaing commit status when using optional attributes

What does this MR do?

This MR fixes updating a commit status when using optional attributes.

Passing different optional attributes in case of updating an existing commit status should not create a new commit status with the same name.

When we create a new commit status, in the UI this will be represented as a retried external job, which is invalid.

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests added for this feature/bug

What are the relevant issue numbers?

Closes #28656 (closed)
Closes #25784 (moved)