Remove scan_execution_policy_ui feature flag

- the scan_execution_policy_ui feature flag and the
  security_orchestration_policies_configuration feature flag
  serve he same purpose, so I am condensing them

Changelog: removed
EE: true

ee/app/assets/javascripts/threat_monitoring/components/policy_editor/policy_editor.vue

@@ -33,7 +33,7 @@ export default {
       return POLICY_KIND_OPTIONS[this.policyType].component;
     },
     shouldAllowPolicyTypeSelection() {
-      return !this.existingPolicy && this.glFeatures.scanExecutionPolicyUi;
+      return !this.existingPolicy && this.glFeatures.securityOrchestrationPoliciesConfiguration;
     },
     shouldShowEnvironmentPicker() {
       return POLICY_KIND_OPTIONS[this.policyType].shouldShowEnvironmentPicker;

ee/app/controllers/projects/threat_monitoring_controller.rb

@@ -7,7 +7,7 @@ module Projects
     before_action :authorize_read_threat_monitoring!
 
     before_action do
-      push_frontend_feature_flag(:scan_execution_policy_ui, @project)
+      push_frontend_feature_flag(:security_orchestration_policies_configuration, @project)
     end
 
     feature_category :not_owned

ee/config/feature_flags/development/scan_execution_policy_ui.yml

----
-name: scan_execution_policy_ui
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/63585
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/273791
-milestone: '14.0'
-type: development
-group: group::container security
-default_enabled: false

ee/spec/frontend/threat_monitoring/components/policy_editor/policy_editor_spec.js

@@ -64,9 +64,9 @@ describe('PolicyEditor component', () => {
     });
   });
 
-  describe('with "scanExecutionPolicyUi" feature flag enabled', () => {
+  describe('with "securityOrchestrationPoliciesConfiguration" feature flag enabled', () => {
     beforeEach(() => {
-      factory({ provide: { glFeatures: { scanExecutionPolicyUi: true } } });
+      factory({ provide: { glFeatures: { securityOrchestrationPoliciesConfiguration: true } } });
     });
 
     it('renders the form select', () => {