Merge branch '377977-schedule-limit-ux' into 'master'

Disable new schedule button when plan limit is reached

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143669



Merged-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Taylor Vanderhelm <tvanderhelm@gitlab.com>
Approved-by: Rudy Crespo <rcrespo@gitlab.com>
Approved-by: Briley Sandlin <bsandlin@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Peter Hegman <phegman@gitlab.com>
Reviewed-by: Rudy Crespo <rcrespo@gitlab.com>
Reviewed-by: Taylor Vanderhelm <tvanderhelm@gitlab.com>
Co-authored-by: Payton Burdette <pburdette@gitlab.com>