Un-quarantine create project spec

What does this MR do?

Un-quarantines create project spec

The number of subgroups under gitlab-qa-sandbox-group on gitlab.com is now at 2672 and the select group drop down, although still slow, does allow selection of the subgroup without the test timing out.

Closes #283925 (closed)

Does this MR meet the acceptance criteria?

Conformity

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