Merge branch '346140-users-rate-limiting' into 'master'

app/controllers/autocomplete_controller.rb

app/controllers/search_controller.rb

app/helpers/application_settings_helper.rb

app/models/application_setting.rb

app/models/application_setting_implementation.rb

app/models/instance_configuration.rb

app/services/search_service.rb

...te/20211213142344_add_settings_user_email_lookup_limit.rb

db/schema_migrations/20211213142344

db/structure.sql

ee/spec/controllers/groups/epics/notes_controller_spec.rb

...rojects/security/vulnerabilities/notes_controller_spec.rb

lib/api/search.rb

lib/gitlab/application_rate_limiter.rb

lib/gitlab/repository_archive_rate_limiter.rb

lib/gitlab/search/params.rb

spec/controllers/autocomplete_controller_spec.rb

spec/controllers/projects/notes_controller_spec.rb

spec/controllers/search_controller_spec.rb

spec/controllers/snippets/notes_controller_spec.rb