Refactor the group_service_spec

What does this MR do and why?

• Remove :clean_gitlab_redis_shared_state because elasticsearch traits dynamically use the :clean_gitlab_redis_shared_state trait
• Move the shared example search respects visibility to the shared_examples/ folder
• Move out the visibility#blob_and_commit into a different file. It was alone taking more than half of the total time.

Screenshots or screen recordings

After the code change

Original

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Closes #372253 (closed)