Add domain rate-limiting options for GitLab Pages
What does this MR do?
Adds options for domain rate-limiting for GitLab Pages.
It's very similar to !5704 (diffs)
Related issues
Checklist
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Required
- 
Merge Request Title, and Description are up to date, accurate, and descriptive 
- 
MR targeting the appropriate branch 
- 
MR has a green pipeline on GitLab.com 
- 
Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks 
- 
trigger-packagehas a green pipeline running against latest commit
Expected (please provide an explanation if not completing)
- 
Test plan indicating conditions for success has been posted and passes 
- 
Documentation created/updated 
- 
Tests added 
- 
Integration tests added to GitLab QA 
- 
Equivalent MR/issue for the GitLab Chart opened 
Edited  by Robert Marshall