Merge branch 'ethan-eurie-473441-add-sds-communication-3e82aeb2' into 'master'

Add gRPC code from the SDS to the Secret Detection gem

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/172743



Merged-by: Gary Holtz <gholtz@gitlab.com>
Approved-by: Paulo Barros <pbarros@gitlab.com>
Approved-by: Gary Holtz <gholtz@gitlab.com>
Approved-by: rossfuhrman <rfuhrman@gitlab.com>
Approved-by: Lucas Charles <me@lucascharles.me>
Reviewed-by: Paulo Barros <pbarros@gitlab.com>
Co-authored-by: Ethan Urie <eurie@gitlab.com>