Backport of [ui] Prevent double-open for cmd+click on vars index links into release/1.9.x

.changelog/24316.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Fix an issue where cmd+click or ctrl+click would double-open a var
+```

ui/app/components/variable-paths.js

@@ -26,13 +26,27 @@ export default class VariablePathsComponent extends Component {
   }
 
   @action
-  async handleFolderClick(path) {
+  async handleFolderClick(path, trigger) {
+    // Don't navigate if the user clicked on a link; this will happen with modifier keys like cmd/ctrl on the link itself
+    if (
+      trigger instanceof PointerEvent &&
+      /** @type {HTMLElement} */ (trigger.target).tagName === 'A'
+    ) {
+      return;
+    }
     this.router.transitionTo('variables.path', path);
   }
 
   @action
-  async handleFileClick({ path, variable: { id, namespace } }) {
+  async handleFileClick({ path, variable: { id, namespace } }, trigger) {
     if (this.can.can('read variable', null, { path, namespace })) {
+      // Don't navigate if the user clicked on a link; this will happen with modifier keys like cmd/ctrl on the link itself
+      if (
+        trigger instanceof PointerEvent &&
+        /** @type {HTMLElement} */ (trigger.target).tagName === 'A'
+      ) {
+        return;
+      }
       this.router.transitionTo('variables.variable', id);
     }
   }

ui/app/controllers/variables/index.js

@@ -15,11 +15,6 @@ export default class VariablesIndexController extends Controller {
 
   isForbidden = false;
 
-  @action
-  goToVariable(variable) {
-    this.router.transitionTo('variables.variable', variable.path);
-  }
-
   @action goToNewVariable() {
     this.router.transitionTo('variables.new');
   }