Merge branch '446292-use-constant-for-DEFAULT_POLICY_TEST_STAGE' into 'master'

Use DEFAULT_POLICY_TEST_STAGE constant

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157307



Merged-by: drew stachon <730684-drew@users.noreply.gitlab.com>
Approved-by: Shreyas Agarwal <sagarwal@gitlab.com>
Approved-by: drew stachon <730684-drew@users.noreply.gitlab.com>
Co-authored-by: Andy Soiron <asoiron@gitlab.com>

ee/app/services/security/security_orchestration_policies/ci_action/custom.rb

@@ -33,7 +33,10 @@ def parse_job_names
 
         def assign_default_stage(job_names)
           job_names.each do |name|
-            @ci_config[name][:stage] = '.pipeline-policy-test' unless @ci_config[name].key?(:stage)
+            unless @ci_config[name].key?(:stage)
+              @ci_config[name][:stage] =
+                ::Gitlab::Ci::Config::SecurityOrchestrationPolicies::Processor::DEFAULT_POLICY_TEST_STAGE
+            end
           end
         end