test: Add test for get_baggage with DSN

[Lms24]

This adds a test for get_baggage that demonstrates that the public key form the DSN is included in the resulting baggage string. This came up internally while debugging an incomplete baggage header in the Sentry backend.
(Turns out the root cause was not 100% related to this test but we might wanna keep it anyway)

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 7.58s

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13657 uncovered lines.

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