[ML] Removing global isServerless flag (#166651)

Removed `isServerless` flag which lived in our global context and had to
be passed about to the various components which create their own version
of the context using `getMlGlobalServices`
This PR adds a new context which contains flags for all of the features
which can be toggled when in serverless mode.
Flags added:
```
 showNodeInfo
 showMLNavMenu
 showLicenseInfo
 isADEnabled
 isDFAEnabled
 isNLPEnabled
```
The enabled features flags are now read from the config file client
side, rather than using capabilities.

Additional changes:
- Changes the wording of the awaiting ML node callout in serverless.
- In the search project, the default ML page is the trained models list
and not Overview
- Reenables the Memory Usage page for all projects

---------

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/ml/server/models/data_frame_analytics/analytics_manager.ts

@@ -19,6 +19,7 @@ import {
   type MapElements,
 } from '@kbn/ml-data-frame-analytics-utils';
 import { isPopulatedObject } from '@kbn/ml-is-populated-object';
+import type { MlFeatures } from '../../../common/constants/app';
 import type { ModelService } from '../model_management/models_provider';
 import { modelsProvider } from '../model_management';
 import {
@@ -36,7 +37,6 @@ import {
   isTransformLinkReturnType,
 } from './types';
 import type { MlClient } from '../../lib/ml_client';
-import type { MlFeatures } from '../../types';
 import { DEFAULT_TRAINED_MODELS_PAGE_SIZE } from '../../routes/trained_models';
 
 export class AnalyticsManager {

x-pack/plugins/ml/server/models/model_management/memory_usage.ts

@@ -9,6 +9,7 @@ import type * as estypes from '@elastic/elasticsearch/lib/api/typesWithBodyKey';
 import numeral from '@elastic/numeral';
 import { pick } from 'lodash';
 import { isDefined } from '@kbn/ml-is-defined';
+import type { MlFeatures } from '../../../common/constants/app';
 import type {
   MemoryUsageInfo,
   TrainedModelStatsResponse,
@@ -22,7 +23,6 @@ import type {
   NodeDeploymentStatsResponse,
   NodesOverviewResponse,
 } from '../../../common/types/trained_models';
-import type { MlFeatures } from '../../types';
 
 // @ts-expect-error numeral missing value
 const AD_EXTRA_MEMORY = numeral('10MB').value();

x-pack/plugins/ml/server/models/notifications_service/notifications_service_provider.ts

@@ -7,6 +7,7 @@
 
 import { IScopedClusterClient } from '@kbn/core/server';
 import type * as estypes from '@elastic/elasticsearch/lib/api/typesWithBodyKey';
+import type { MlFeatures } from '../../../common/constants/app';
 import type { MLSavedObjectService } from '../../saved_objects';
 import type { NotificationItem, NotificationSource } from '../../../common/types/notifications';
 import { ML_NOTIFICATION_INDEX_PATTERN } from '../../../common/constants/index_patterns';
@@ -19,7 +20,6 @@ import type {
   NotificationsCountResponse,
   NotificationsSearchResponse,
 } from '../../../common/types/notifications';
-import type { MlFeatures } from '../../types';
 
 const MAX_NOTIFICATIONS_SIZE = 10000;