Sign out after the github import test

What does this MR do?

Tests after the github import test fail in the quarantine job. This MR tries to fix that by signing out after the test.

Closes #193485 (closed)

Conformity

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