[ML] Adds a11y tests for categorization and recognizer job wizards (e…

…lastic#162126)

## Summary

Adds accessibility tests for the categorization and data recognizer
anomaly detection job wizards.

As part of this PR I have split out the tests for the anomaly detection
pages into a separate file as the original `ml.ts` file was getting very
large.

Part of elastic#160712
Part of elastic#88496

### 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

x-pack/plugins/ml/public/application/jobs/new_job/recognize/components/job_settings_form.tsx

@@ -154,6 +154,7 @@ export const JobSettingsForm: FC<JobSettingsFormProps> = ({
               value={jobPrefix}
               onChange={({ target: { value } }) => setJobPrefix(value)}
               isInvalid={!!validationResult.jobPrefix}
+              data-test-subj="mlJobRecognizerWizardInputJobIdPrefix"
             />
           </EuiFormRow>
         </EuiDescribedFormGroup>
@@ -210,6 +211,7 @@ export const JobSettingsForm: FC<JobSettingsFormProps> = ({
             />
           }
           paddingSize="l"
+          data-test-subj="mlJobWizardToggleAdvancedSection"
         >
           <EuiDescribedFormGroup
             title={
@@ -227,7 +229,10 @@ export const JobSettingsForm: FC<JobSettingsFormProps> = ({
               />
             }
           >
-            <EuiFormRow describedByIds={['ml_aria_label_new_job_dedicated_index']}>
+            <EuiFormRow
+              describedByIds={['ml_aria_label_new_job_dedicated_index']}
+              data-test-subj="mlJobWizardAdvancedSection"
+            >
               <EuiSwitch
                 id="useDedicatedIndex"
                 name="useDedicatedIndex"

x-pack/plugins/ml/public/application/jobs/new_job/recognize/page.tsx

@@ -319,7 +319,7 @@ export const Page: FC<PageProps> = ({ moduleId, existingGroupIds }) => {
 
       {jobsAwaitingNodeCount > 0 && <JobsAwaitingNodeWarning jobCount={jobsAwaitingNodeCount} />}
 
-      <EuiFlexGroup wrap={true} gutterSize="m">
+      <EuiFlexGroup wrap={true} gutterSize="m" data-test-subj="mlPageJobWizard recognizer">
         <EuiFlexItem grow={1}>
           <EuiPanel grow={false} hasShadow={false} hasBorder>
             <EuiTitle size="s">