Clean up Gradle Scan Tests

What does this MR do?

Cleans up some Gradle tests following removal of the legacy code path.

What are the relevant issue numbers?

Refactor Gradle Scan Tests with New Shared Exam... (gitlab-org/gitlab#446088 - closed) • Philip Cunningham • 17.1 • On track

Note

Since the experimental tests were replaced in a preceding merge request, the scope of these changes were reduced. This is why the linked issue indicates more extensive changes were necessary.

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
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• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer