Add E2E tests for the spring sample

[alexander-alderman-webb]

📜 Description

#skip-changelog

Follow up on #4635, with similar changes as the spring sample is analogous to the spring-jakarta sample.

One notable difference is that the Spring Boot 2's BOM pulls in Kotlin and Jackson versions that are incompatible with the ones specified in our version catalogue. I therefore included Kotlin and Jackson BOMs after the Spring Boot one. As a nice side effect spotlessGradleApply started working again on the sample.

💡 Motivation and Context

• Closes Add E2E tests for Spring #4609

💚 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]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	426.89 ms	461.90 ms	35.00 ms
Size	1.58 MiB	2.10 MiB	530.95 KiB