Add group-level scan execution policy validation

- use same mechanism as project-level
- update configuration to allow for group-level

Changelog: added

EE: true

ee/app/assets/javascripts/security_orchestration/components/policy_editor_schema_ext.js

@@ -6,6 +6,7 @@ import { POLICY_TYPE_COMPONENT_OPTIONS } from './constants';
 const SCHEMA_DICT = {
   [POLICY_TYPE_COMPONENT_OPTIONS.scanExecution.urlParameter]: {
     [NAMESPACE_TYPES.PROJECT]: getSingleScanExecutionPolicySchema,
+    [NAMESPACE_TYPES.GROUP]: getSingleScanExecutionPolicySchema,
   },
 };
 

ee/spec/frontend/security_orchestration/components/policy_editor_schema_ext_spec.js

@@ -50,7 +50,7 @@ describe('PolicySchemaExtension', () => {
       it.each`
         title         | policyType                                                  | namespaceType              | itRegistersASchema | schemaFunction
         ${'does'}     | ${POLICY_TYPE_COMPONENT_OPTIONS.scanExecution.urlParameter} | ${NAMESPACE_TYPES.PROJECT} | ${true}            | ${getSingleScanExecutionPolicySchema}
-        ${'does not'} | ${POLICY_TYPE_COMPONENT_OPTIONS.scanExecution.urlParameter} | ${NAMESPACE_TYPES.GROUP}   | ${false}           | ${() => ({})}
+        ${'does'}     | ${POLICY_TYPE_COMPONENT_OPTIONS.scanExecution.urlParameter} | ${NAMESPACE_TYPES.GROUP}   | ${true}            | ${getSingleScanExecutionPolicySchema}
         ${'does not'} | ${POLICY_TYPE_COMPONENT_OPTIONS.scanResult.urlParameter}    | ${NAMESPACE_TYPES.PROJECT} | ${false}           | ${() => ({})}
         ${'does not'} | ${POLICY_TYPE_COMPONENT_OPTIONS.scanResult.urlParameter}    | ${NAMESPACE_TYPES.GROUP}   | ${false}           | ${() => ({})}
       `(