Add UI tests for commit signature badges

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Why are we doing this work

The commit signature badges are rendered via several HAML templates in https://gitlab.com/gitlab-org/gitlab/-/tree/3f56fd6515ae57f91c5b7619381a14f84c3843c0/app/views/projects/commit.

Currently, we do not have any tests for these. We should add tests for all signatures types and also all signature verification states. The test bootstrapping for signatures is also non-trivial, so this may be a good opportunity to add some shared-contexts for these.

Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

Add tests for the signature badge to spec/views/projects/commit/show.html.haml_spec.rb.

Verification steps