fix: ensure all extensions are visible during integration tests

- Modified SeleniumHelper.loadUri to automatically append showAllExtensions=true
  to the test URI.
- This ensures that hidden extensions like EV3 are accessible to tests that
  interact with the extension library UI.
- Fixes CI failure in test/integration/connection-modal.test.js.

Co-Authored-By: Gemini <noreply@google.com>

Author: takaokouji

test/helpers/selenium-helper.js

@@ -249,8 +249,8 @@ class SeleniumHelper {
      * @returns {Promise} A promise that resolves when the URI is loaded.
      */
     async loadUri (uri) {
+        const locale = 'locale=en';
         if (uri.indexOf('locale=') < 0) {
-            const locale = 'locale=en';
             if (uri.indexOf('?') >= 0) {
                 uri = uri.replace('?', `?${locale}&`);
             } else if (uri.indexOf('#') >= 0) {
@@ -259,6 +259,16 @@ class SeleniumHelper {
                 uri = `${uri}?${locale}`;
             }
         }
+        if (uri.indexOf('showAllExtensions=') < 0) {
+            const showAllExtensions = 'showAllExtensions=true';
+            if (uri.indexOf('?') >= 0) {
+                uri = uri.replace('?', `?${showAllExtensions}&`);
+            } else if (uri.indexOf('#') >= 0) {
+                uri = uri.replace('#', `?${showAllExtensions}#`);
+            } else {
+                uri = `${uri}?${showAllExtensions}`;
+            }
+        }
 
         const outerError = new Error(`loadUri failed with arguments:\n\turi: ${uri}`);
         try {