Add test to validate cert name selection logic

[geofffranks]

• [x] Read the Contributing document.

Summary

Adds a test to ensure we don't break the certificate selection logic that broke when we removed the BuildNameToCertificate() call in v0.293.0 and v0.294.0.

Backward Compatibility

Breaking Change? No

[geofffranks]

@maxmoehl when you get a chance can you review this + validate it catches the case we regressed on?