Render correct pipeline statuses for tags

Joe Woodwardrequested to merge
fix/tag-pipeline-statuses into master

What does this MR do and why?

Render correct pipeline statuses for tags

This change passes ref_type: :tags to the CommitStatusesFinder to ensure we are only returning pipelines for tags. This prevents issues when a tag and branch share the same name.

References

Related to Tag list page links to latest pipeline of the c... (#347526)

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