Profiling docs for hybrid SDKs: clarify platform support

[kahest]

The docs currently don't clarify which level of profiling is supported on which platforms.

E.g. RN currently supports

• JS profiling via Hermes profiler on all/most platforms (there was a recent issue that indicates it might not work on tvOS?)
• native profiling on Apple platforms via sentry-cocoa
  • only Swift + ObjC level
  • only on iOS + macOS
• native profiling on Android via sentry-java
  • only Kotlin + Java level

TBD: status of support on Flutter (likely 100% dependent on sentry-cocoa/java)

Note that the product docs briefly touch on platform/language support for iOS/Android: https://docs.sentry.io/product/explore/profiling/

### Platforms
- [ ] https://github.com/getsentry/sentry-dart/issues/2197
- [ ] https://github.com/getsentry/sentry-react-native/issues/3973
- [ ] https://github.com/getsentry/sentry-docs/issues/12089

[vaind]

TBD: status of support on Flutter (likely 100% dependent on sentry-cocoa/java)

correct, iOS & macOS only

https://docs.sentry.io/platforms/flutter/profiling/#enable-profiling - Flutter Profiling alpha is available for iOS and macOS since SDK version 7.12.0.

[linear]

ENG-4957 Profiling docs for hybrid SDKs: clarify platform support