[FTR] Enabled Spaces API tests on MKI (#230073)

## Summary

Enabled Spaces API tests on MKI.


### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

__Closes: https://github.com/elastic/kibana/issues/207361__

Author: elena-shostak

x-pack/platform/test/spaces_api_integration/deployment_agnostic/security_and_spaces/apis/copy_to_space/index_trial.ts

@@ -9,8 +9,6 @@ import type { DeploymentAgnosticFtrProviderContext } from '../../../ftr_provider
 
 export default function ({ loadTestFile, getService }: DeploymentAgnosticFtrProviderContext) {
   describe('spaces api with security', function () {
-    // Should be enabled when custom roles can be provisioned for MKI
-    // See: https://github.com/elastic/kibana/issues/207361
     this.tags('skipMKI');
 
     loadTestFile(require.resolve('./copy_to_space'));

x-pack/platform/test/spaces_api_integration/deployment_agnostic/security_and_spaces/apis/index.serverless.ts

@@ -9,9 +9,6 @@ import type { DeploymentAgnosticFtrProviderContext } from '../../ftr_provider_co
 
 export default function ({ loadTestFile }: DeploymentAgnosticFtrProviderContext) {
   describe('spaces api with security', function () {
-    // Should be enabled when custom roles can be provisioned for MKI
-    // See: https://github.com/elastic/kibana/issues/207361
-    this.tags('skipMKI');
     loadTestFile(require.resolve('./resolve_copy_to_space_conflicts'));
     loadTestFile(require.resolve('./create'));
     loadTestFile(require.resolve('./delete'));