Merge branch 'reduce-cluster-test-runtime' into 'master'

Reduce number of records created in cluster controller tests

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/127950



Merged-by: Shinya Maeda <shinya@gitlab.com>
Approved-by: Hunter Stewart <hustewart@gitlab.com>
Approved-by: Shinya Maeda <shinya@gitlab.com>
Co-authored-by: Tiger <twatson@gitlab.com>