React Git Bridge Modal (#3757)

* git-bridge-modal react component and stories
* added react git-bridge-modal to angular tree

GitOrigin-RevId: cf883b776a9ddc7975977534dc453ece4b3ec431

services/web/test/frontend/helpers/render-with-context.js

@@ -12,6 +12,7 @@ export function renderWithEditorContext(
 ) {
   window.user = user || window.user
   window.ExposedSettings.appName = 'test'
+  window.gitBridgePublicBaseUrl = 'git.overleaf.test'
   window.project_id = projectId != null ? projectId : window.project_id
   window._ide = {
     $scope: {