Make "Static status check names" default for GitHub integration

What does this MR do?

Change GitHub integration to use static status check names by default for new projects.

Related to #9931 (closed)
Documentation MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32385

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers