Fix Style/RedundantRegexpEscape offenses

.rubocop_todo/style/redundant_regexp_escape.yml

spec/controllers/projects_controller_spec.rb

spec/features/read_only_spec.rb

spec/helpers/tab_helper_spec.rb

spec/lib/banzai/filter/references/reference_filter_spec.rb

spec/lib/banzai/filter/syntax_highlight_filter_spec.rb

...eline/incident_management/timeline_event_pipeline_spec.rb

...d_migration/backfill_work_item_type_id_for_issues_spec.rb

spec/lib/gitlab/ci/config_spec.rb

...b/ci/parsers/security/validators/schema_validator_spec.rb

spec/lib/gitlab/import_export/saver_spec.rb

spec/lib/gitlab/kubernetes/kube_client_spec.rb

spec/lib/gitlab/sql/pattern_spec.rb

spec/lib/gitlab/usage/metrics/name_suggestion_spec.rb

.../gitlab/usage/metrics/names_suggestions/generator_spec.rb

.../lib/gitlab/usage_data_counters/hll_redis_counter_spec.rb

spec/mailers/emails/profile_spec.rb

spec/models/release_highlight_spec.rb

...ts/api/graphql/mutations/merge_requests/set_draft_spec.rb

spec/requests/api/graphql_spec.rb