Fix button selector for Lightning app e2e tests (#13984)

(cherry picked from commit 332182d)

Author: alecmerdler

src/lightning_app/testing/testing.py

@@ -227,13 +227,20 @@ def run_app_in_cloud(app_folder: str, app_name: str = "app.py") -> Generator:
                 [LIGHTNING_CLOUD_PROJECT_ID],
             )
         admin_page.goto(f"{Config.url}/{Config.username}/apps")
+
+        # Closing the Create Project dialog.
         try:
-            # Closing the Create Project modal
-            button = admin_page.locator('button:has-text("Cancel")')
+            project_dialog = admin_page.locator("text=Create a project")
+            project_dialog.wait_for(timeout=10 * 1000, state="visible")
+            print("'Create Project' dialog visible, closing it.")
+            project_name_input = admin_page.locator('input[type="text"]')
+            project_name_input.fill("Default Project")
+            button = admin_page.locator('button:has-text("Continue")')
             button.wait_for(timeout=3 * 1000)
             button.click()
-        except (playwright._impl._api_types.Error, playwright._impl._api_types.TimeoutError):
-            pass
+        except playwright._impl._api_types.TimeoutError:
+            print("'Create Project' dialog not visible, skipping.")
+
         admin_page.locator(f"text={name}").click()
         admin_page.evaluate(
             """data => {