[ML] Functional tests - stabilize typing in DFA mml input (#66706)

This PR wraps the model memory value setting during data frame analytics job creation in a retry.

Author: pheyos

x-pack/test/functional/services/machine_learning/data_frame_analytics_creation.ts

@@ -287,10 +287,16 @@ export function MachineLearningDataFrameAnalyticsCreationProvider(
     },
 
     async setModelMemory(modelMemory: string) {
-      await mlCommon.setValueWithChecks('mlAnalyticsCreateJobFlyoutModelMemoryInput', modelMemory, {
-        clearWithKeyboard: true,
+      await retry.tryForTime(15 * 1000, async () => {
+        await mlCommon.setValueWithChecks(
+          'mlAnalyticsCreateJobFlyoutModelMemoryInput',
+          modelMemory,
+          {
+            clearWithKeyboard: true,
+          }
+        );
+        await this.assertModelMemoryValue(modelMemory);
       });
-      await this.assertModelMemoryValue(modelMemory);
     },
 
     async assertCreateIndexPatternSwitchExists() {