Merge branch '435310-cleanup-blob_blame_info-ff' into 'master'

Cleanup blob_blame_info feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141853



Merged-by: Tomas Bulva <tbulva@gitlab.com>
Approved-by: Lorenz van Herwaarden <lvanherwaarden@gitlab.com>
Approved-by: Tomas Bulva <tbulva@gitlab.com>
Co-authored-by: Jacques <jerasmus@gitlab.com>