Merge branch 'el-remove-unused-rate-limit' into 'master'

Remove unused rate limit definition

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/155410



Merged-by: Eugie Limpin <elimpin@gitlab.com>
Approved-by: Juliet Wanjohi <jwanjohi@gitlab.com>
Approved-by: Sylvester Chin <schin@gitlab.com>

lib/gitlab/application_rate_limiter.rb

@@ -67,7 +67,6 @@ def rate_limits # rubocop:disable Metrics/AbcSize
           project_testing_integration: { threshold: 5, interval: 1.minute },
           email_verification: { threshold: 10, interval: 10.minutes },
           email_verification_code_send: { threshold: 10, interval: 1.hour },
-          phone_verification_challenge: { threshold: 2, interval: 1.day },
           phone_verification_send_code: { threshold: 5, interval: 1.day },
           phone_verification_verify_code: { threshold: 5, interval: 1.day },
           namespace_exists: { threshold: 20, interval: 1.minute },