Migrate features/project/project.feature to RSpec and reorganize several Project feature specs (!18223) · Merge requests · GitLab.org / GitLab FOSS · GitLab

What does this MR do?

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/23036.

This migrates features/project/project.feature to RSpec and reorganizes several Project feature specs.

Does this MR meet the acceptance criteria?

Tests added for this feature/bug
Review
- Has been reviewed by Backend
Conform by the merge request performance guides
Conform by the style guides
Squashed related commits together