[Security solution][Detections] increases test coverage for bulk edit (…

…#137165)

## Summary

- addresses #135201, apart from data views
- adds tests for scenarios in test plan: [internal document](https://docs.google.com/document/d/116x7ITTTJQ6cTiwaGK831_f6Ox7XB3qyLiHxC3Cmf8w/edit#)
- adds data-test-subj attributes to error toasts


### Checklist

Delete any items that are not applicable to this PR.

- [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

packages/core/notifications/core-notifications-browser-internal/src/toasts/error_toast.tsx

@@ -73,7 +73,7 @@ function showErrorDialog({
           <EuiModalHeader>
             <EuiModalHeaderTitle>{title}</EuiModalHeaderTitle>
           </EuiModalHeader>
-          <EuiModalBody>
+          <EuiModalBody data-test-subj="errorModalBody">
             <EuiCallOut size="s" color="danger" iconType="alert" title={error.message} />
             {text && (
               <React.Fragment>
@@ -112,6 +112,7 @@ export function ErrorToast({
         <EuiButton
           size="s"
           color="danger"
+          data-test-subj="errorToastBtn"
           onClick={() => showErrorDialog({ title, error, openModal, i18nContext })}
         >
           <FormattedMessage