Skip GitHub OAuth Test

What does this MR do?

Skips GitHub OAuth test while a solution is investigated. It is necessary to skip this test because a failure in the pipeline would block access to GitHub hindering any investigation work.

Related to: #36305 (closed)

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content