Simplified error passing for policy editor

.changelog/15435.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+ui: The web UI now provides a Token Management interface for management users on policy pages
+```

ui/app/components/policy-editor.js

@@ -2,7 +2,6 @@ import Component from '@glimmer/component';
 import { action } from '@ember/object';
 import { inject as service } from '@ember/service';
 import { alias } from '@ember/object/computed';
-import messageForError from 'nomad-ui/utils/message-from-adapter-error';
 
 export default class PolicyEditorComponent extends Component {
   @service flashMessages;
@@ -22,14 +21,9 @@ export default class PolicyEditorComponent extends Component {
     try {
       const nameRegex = '^[a-zA-Z0-9-]{1,128}$';
       if (!this.policy.name?.match(nameRegex)) {
-        throw {
-          errors: [
-            {
-              detail:
-                'Policy name must be 1-128 characters long and can only contain letters, numbers, and dashes.',
-            },
-          ],
-        };
+        throw new Error(
+          `Policy name must be 1-128 characters long and can only contain letters, numbers, and dashes.`
+        );
       }
 
       const shouldRedirectAfterSave = this.policy.isNew;
@@ -60,7 +54,7 @@ export default class PolicyEditorComponent extends Component {
     } catch (error) {
       this.flashMessages.add({
         title: `Error creating Policy ${this.policy.name}`,
-        message: messageForError(error),
+        message: error,
         type: 'error',
         destroyOnClick: false,
         sticky: true,