Fix flaky RateLimiter test

[stefanosiano]

📜 Description

#skip-changelog

💡 Motivation and Context

RateLimiterTest close cancels the timer was flaky
Now it uses reflection to assert the timer was cancelled

💚 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

[adinauer]

Nice, thank you!

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	456.19 ms	473.73 ms	17.54 ms
Size	1.65 MiB	2.31 MiB	677.61 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
00c8eeb	415.32 ms	428.08 ms	12.76 ms

App size

Revision	Plain	With Sentry	Diff
00c8eeb	1.70 MiB	2.36 MiB	671.98 KiB