Merge branch 'remove-ff-project-overview-reorg' into 'master'

Removes project_overview_reorg feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/145678



Merged-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Michael Le <mle@gitlab.com>
Approved-by: Tyler Amos <tamos@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Tyler Amos <tamos@gitlab.com>
Reviewed-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Sascha Eggenberger <seggenberger@gitlab.com>
Reviewed-by: Mohamed Hamda <mhamda@gitlab.com>
Co-authored-by: Sascha Eggenberger <seggenberger@gitlab.com>