Revert "reenable regression and classification functional tests (#70661)"

This reverts commit a9b543d.

Author: alvarezmelissa87

x-pack/test/functional/apps/ml/data_frame_analytics/classification_creation.ts

@@ -10,8 +10,8 @@ import { FtrProviderContext } from '../../../ftr_provider_context';
 export default function ({ getService }: FtrProviderContext) {
   const esArchiver = getService('esArchiver');
   const ml = getService('ml');
-
-  describe('classification creation', function () {
+  // flaky test https://github.com/elastic/kibana/issues/70455
+  describe.skip('classification creation', function () {
     before(async () => {
       await esArchiver.loadIfNeeded('ml/bm_classification');
       await ml.testResources.createIndexPatternIfNeeded('ft_bank_marketing', '@timestamp');

x-pack/test/functional/apps/ml/data_frame_analytics/regression_creation.ts

@@ -10,8 +10,8 @@ import { FtrProviderContext } from '../../../ftr_provider_context';
 export default function ({ getService }: FtrProviderContext) {
   const esArchiver = getService('esArchiver');
   const ml = getService('ml');
-
-  describe('regression creation', function () {
+  // flaky test https://github.com/elastic/kibana/issues/70455
+  describe.skip('regression creation', function () {
     before(async () => {
       await esArchiver.loadIfNeeded('ml/egs_regression');
       await ml.testResources.createIndexPatternIfNeeded('ft_egs_regression', '@timestamp');