Fix editing of scan execution policies

- update `isEditing` computed property
- update tests

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

@@ -40,7 +40,10 @@ export default {
       return this.isEditing ? this.policyType : this.newPolicyType;
     },
     isEditing() {
-      return Boolean(this.existingPolicy?.creation_timestamp || this.existingPolicy?.updatedAt);
+      return Boolean(
+        this.existingPolicy?.creation_timestamp ||
+          this.existingPolicy?.type === POLICY_TYPE_COMPONENT_OPTIONS.scanExecution.urlParameter,
+      );
     },
     policyTypes() {
       return Object.values(POLICY_TYPE_COMPONENT_OPTIONS);

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

@@ -93,9 +93,9 @@ describe('PolicyEditor component', () => {
 
   describe('when an existing policy is present', () => {
     it.each`
-      policyType                 | option                                         | existingPolicy                                                     | findComponent
-      ${'container_policy'}      | ${POLICY_TYPE_COMPONENT_OPTIONS.container}     | ${{ manifest: mockL3Manifest, updatedAt: '2020-04-14T00:08:30Z' }} | ${findNeworkPolicyEditor}
-      ${'scan_execution_policy'} | ${POLICY_TYPE_COMPONENT_OPTIONS.scanExecution} | ${mockDastScanExecutionObject}                                     | ${findScanExecutionPolicyEditor}
+      policyType                 | option                                         | existingPolicy                                                              | findComponent
+      ${'container_policy'}      | ${POLICY_TYPE_COMPONENT_OPTIONS.container}     | ${{ manifest: mockL3Manifest, creation_timestamp: '2020-04-14T00:08:30Z' }} | ${findNeworkPolicyEditor}
+      ${'scan_execution_policy'} | ${POLICY_TYPE_COMPONENT_OPTIONS.scanExecution} | ${mockDastScanExecutionObject}                                              | ${findScanExecutionPolicyEditor}
     `(
       'renders the disabled form select for existing policy of type $policyType',
       async ({ existingPolicy, findComponent, option, policyType }) => {

ee/spec/frontend/threat_monitoring/components/policy_editor/scan_execution_policy/lib/from_yaml_spec.js

@@ -6,6 +6,6 @@ import {
 
 describe('fromYaml', () => {
   it('returns policy object', () => {
-    expect(fromYaml(mockDastScanExecutionManifest)).toMatchObject(mockDastScanExecutionObject);
+    expect(fromYaml(mockDastScanExecutionManifest)).toStrictEqual(mockDastScanExecutionObject);
   });
 });

ee/spec/frontend/threat_monitoring/mocks/mock_data.js

@@ -23,7 +23,6 @@ rules:
   - type: pipeline
     branches:
       - main
-updatedAt: '2020-04-14T00:08:30Z'
 actions:
   - scan: dast
     site_profile: required_site_profile
@@ -36,7 +35,6 @@ export const mockDastScanExecutionObject = {
   description: 'This policy enforces pipeline configuration to have a job with DAST scan',
   enabled: false,
   rules: [{ type: 'pipeline', branches: ['main'] }],
-  updatedAt: '2020-04-14T00:08:30Z',
   actions: [
     {
       scan: 'dast',