Merge Status Tool Tip Fails in March

What does this MR do?

• The pattern matcher in the merge status tooltip was not using the proper syntax to match a wildcard.
• The test fails in the month of March. One month ago from March 1 is Feb 1. Rails DateTime thinks 1 month is 30 days. 28 days != 1 month. Fixed to use 14 days so it always works.

What are the relevant issue numbers?

Resolves gitlab-org/gitlab-ce#58374

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #58374 (closed)