Add system tests for distributed tracing

[adinauer]

#skip-changelog

📜 Description

We now run tests that assert distributed tracing by having a Spring boot server call into itself via HTTP

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 1dd3ea4

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	445.02 ms	483.76 ms	38.74 ms
Size	1.58 MiB	2.21 MiB	642.21 KiB

Previous results on branch: feat/distributed-tracing-system-tests

Startup times

Revision	Plain	With Sentry	Diff
a75dbee	369.13 ms	428.11 ms	58.98 ms

App size

Revision	Plain	With Sentry	Diff
a75dbee	1.58 MiB	2.21 MiB	641.82 KiB

[markushi]

Nice, LGTM!