[ML] DF Analytics job creation: Add 'excludes' input field to form (#53856)

* Add exclude fields input to df analytics creation form

* rename explain api endpoint to general explainDataFrameAnalytics

* wip: use explain api for exclude fields

* show error message if classification depVar has cardinality of > 2

* update types

* updates after conflict resolution

* prevent creation if more than 2 distinct classes for class job. create form field validation file

Author: alvarezmelissa87

x-pack/legacy/plugins/ml/public/application/data_frame_analytics/common/analytics.ts

@@ -58,6 +58,23 @@ export enum INDEX_STATUS {
   ERROR,
 }
 
+export interface FieldSelectionItem {
+  name: string;
+  mappings_types: string[];
+  is_included: boolean;
+  is_required: boolean;
+  feature_type?: string;
+  reason?: string;
+}
+
+export interface DfAnalyticsExplainResponse {
+  field_selection: FieldSelectionItem[];
+  memory_estimation: {
+    expected_memory_without_disk: string;
+    expected_memory_with_disk: string;
+  };
+}
+
 export interface Eval {
   meanSquaredError: number | string;
   rSquared: number | string;

x-pack/legacy/plugins/ml/public/application/data_frame_analytics/pages/analytics_management/components/create_analytics_form/create_analytics_form.test.tsx

@@ -40,7 +40,7 @@ describe('Data Frame Analytics: <CreateAnalyticsForm />', () => {
     );
 
     const euiFormRows = wrapper.find('EuiFormRow');
-    expect(euiFormRows.length).toBe(8);
+    expect(euiFormRows.length).toBe(9);
 
     const row1 = euiFormRows.at(0);
     expect(row1.find('label').text()).toBe('Job type');