Merge branch '498066-convert-redis-counts-for-diffscounter' into 'master'

Convert redis counts for DiffsCounter

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/182427



Merged-by: Bob Van Landuyt <bob@gitlab.com>
Approved-by: Thomas Randolph <trandolph@gitlab.com>
Approved-by: Miguel Rincon <mrincon@gitlab.com>
Approved-by: Bob Van Landuyt <bob@gitlab.com>
Co-authored-by: Jonas Larsen <jlarsen@gitlab.com>