Skip Redundant Tests

[n7studios]

Summary

Skips duplicate tests in the API Key test class, where a previous test already checked that the ClientException was returned due to the method being supported via OAuth only.

Testing

Existing tests pass.

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• The code passes when running PHPStan
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)