Add project milestone link

What does this MR do?

Adds link to the project associated with the milestone on the dashboard milestone page.

What are the relevant issue numbers?

Closes #49289 (closed) - Add project milestone links to dashboard milestones page

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 e2 tests" label. See the Test Planning Process.

View of the new milestone dashboard

View of the new milestone dropdown