Migrate st balloons to playwright (streamlit#8678)

## Describe your changes
- title, does it by checking the data-testid exists
## GitHub Issue Link (if applicable)

## Testing Plan

- Explanation of why no additional tests are needed
- Unit Tests (JS and/or Python)
- E2E Tests
- Any manual testing needed?

---

**Contribution License Agreement**

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project are made under the Apache 2.0 license.

e2e_playwright/st_balloons_test.py

@@ -0,0 +1,19 @@
+# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2024)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from playwright.sync_api import Page, expect
+
+
+def test_balloons_are_present_on_page(app: Page):
+    expect(app.get_by_test_id("balloons")).to_have_count(1)