Expose the tag_list in the Jobs API

What does this MR do?

This MR adds the :tag_list attribute to the jobs API. As it's very minor and only adds an exposed property, I don't believe it posts any risk.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

I might have put the changelog in the wrong directory. Please let me know if I did...

• 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 #24488 (closed)