Remove metric related unused routes from project file

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/124027



Merged-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Ankit Panchal <apanchal@gitlab.com>
Approved-by: Paulina Sedlak-Jakubowska <psedlak-jakubowska@gitlab.com>
Approved-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Jose Ivan Vargas <jvargas@gitlab.com>
Reviewed-by: Peter Leitzen <pleitzen@gitlab.com>
Reviewed-by: Shinya Maeda <shinya@gitlab.com>
Reviewed-by: Rajendra Kadam <rkadam@gitlab.com>
Reviewed-by: Ankit Panchal <apanchal@gitlab.com>
Co-authored-by: Rajendra Kadam <rkadam@gitlab.com>