Extend backend e2e tests

[adinauer]

📜 Description

• Add a new sample sentry-samples-spring-boot-jakarta-opentelemetry to showcase combining Sentry and OpenTelemetry
• Improve tests to no longer only check for number of envelopes received by relay but instead actually assert the content (e.g. a transaction with a certain op, or a transaction that has a span with a certain op)

Also has a fix for ignoring spans created by the GraphQL v22 integration. Also fixes the Spring Boot 3 WebFlux sample to use GraphQL v22.

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code.
• 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.
• 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 777173a

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	641.66 ms	709.84 ms	68.18 ms
Size	1.70 MiB	2.36 MiB	671.42 KiB

Previous results on branch: feat/extend-backend-e2e-tests

Startup times

Revision	Plain	With Sentry	Diff
5942657	397.92 ms	417.90 ms	19.98 ms
3226143	408.83 ms	452.96 ms	44.13 ms
dc8178c	404.79 ms	432.84 ms	28.06 ms
9a21ffe	428.26 ms	448.80 ms	20.54 ms
1732412	378.67 ms	457.52 ms	78.85 ms
e1dbabf	411.02 ms	415.20 ms	4.18 ms
42e3a25	485.09 ms	551.70 ms	66.61 ms

App size

Revision	Plain	With Sentry	Diff
5942657	1.70 MiB	2.36 MiB	671.41 KiB
3226143	1.70 MiB	2.36 MiB	671.41 KiB
dc8178c	1.70 MiB	2.36 MiB	671.42 KiB
9a21ffe	1.70 MiB	2.36 MiB	671.41 KiB
1732412	1.70 MiB	2.36 MiB	671.41 KiB
e1dbabf	1.70 MiB	2.36 MiB	671.41 KiB
42e3a25	1.70 MiB	2.36 MiB	671.41 KiB

[lbloder]

Sentry Sample Spring Boot 3.0+ and OpenTelemetry

[lbloder]

I think it would be good to add the fact, that this is a sample including OTEL, something like:
Sample application showing how to use Sentry with Spring boot from version 3.0 onwards and OpenTelemetry.

Also, we might want to add some guidance on how to add the otel agent in the readme wdyt?

[lbloder]

We could also add some instructions on how to run the system-tests locally