Add glob for CI changes detection

What does this MR do?

Allow to use:

some_job:
  ...
  only:
    changes:
      - '**/*.{rb,rake,erb}'

Instead of:

some_job:
  ...
  only:
    changes:
      - '**/*.rb'
      - '**/*.rake'
      - '**/*.erb'

What are the relevant issue numbers?

None?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• 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.