Fix and un-skip LFS and 2FA audit log specs

What does this MR do?

Fixes and un-skips LFS and 2FA audit log specs

The 2FA spec needed updates as enabling 2FA on a shared group and user would cause other tests to land on an unexpected state.

Closes https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/567 https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/566

Conformity

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