test: add tests for git connection (#1289)

* chore: add data-test attributes

* test: add github connection test, add applications modal

* chore: embed test GITHUB_CLIENT_* environment values

---------

Co-authored-by: Ali BARIN <ali.barin53@gmail.com>

packages/e2e-tests/fixtures/applications-page.js

@@ -1,4 +1,5 @@
 const path = require('node:path');
+const { ApplicationsModal } = require('./applications-modal');
 const { AuthenticatedPage } = require('./authenticated-page');
 
 export class ApplicationsPage extends AuthenticatedPage {
@@ -13,4 +14,9 @@ export class ApplicationsPage extends AuthenticatedPage {
     this.drawerLink = this.page.getByTestId('apps-page-drawer-link');
     this.addConnectionButton = this.page.getByTestId('add-connection-button');
   }
+
+  async openAddConnectionModal () {
+    await this.addConnectionButton.click();
+    return new ApplicationsModal(this.page);
+  }
 }