Use Vue component for file diffs header

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Summary

The new merge request diff header.

Improvements

The diff header for submitted merge requests has been refactored to use diff_file_header.vue. New merge requests should do the same.

Risks

I don't believe there are any risks as this has already been done for submitted MRs and the functionality is the same.

Involved components

app/assets/javascripts/diffs/components/diff_file_header.vue app/views/projects/diffs/_file_header.html.haml

Optional: Intended side effects

The file diffs headers should match.

Optional: Missing test coverage

N/A