WIP: add integration test tldr

[justusschock]

What does this PR do?

Fixes #<issue_number>

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cc @carmocca @akihironitta @Borda

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 lightning: Flagships

Check ID	Status
test-flagships / run-flagships (flashy, Lightning-Universe/Flashy-app)	success	✅

These checks are required after the changes to .github/workflows/_flagship-apps.yml, tests/integrations_app/flagship/test_tldr.py.

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