Merge branch 'rd-clarify-scope-of-cssd' into 'master'

Clarify scope of client-side secret detection

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168479



Merged-by: Phillip Wells <pwells@gitlab.com>
Approved-by: Ahmed Hemdan <ahemdan@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Reviewed-by: Ahmed Hemdan <ahemdan@gitlab.com>
Co-authored-by: Russell Dickenson <rdickenson@gitlab.com>