Extend merge request widget pipeline block for merge request pipelines

What does this MR do?

Merge request widget pipeline block

Requirements	Mockups
Normal branch pipeline Unchanged
Detached merge request pipeline Ref now shows merge request ID/Link before the source branch
Merged result merge request pipeline Ref now shows merge request ID/Link before source branch and adds target branch

What are the relevant issue numbers?

Related gitlab-ee#7380 #58454 (moved)

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