fix: sentry-android-ndk proguard rule keeps all native class

[ghasemdev]

:scroll: Description

https://github.com/getsentry/sentry-java/issues/4426

:bulb: Motivation and Context

:green_heart: How did you test it?

:pencil: 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.

:crystal_ball: Next steps