docs: Clarify systrace tool deprecation in profiling guide

Fixes #3679

Added a note clarifying that the standalone systrace tool has been
removed from Android platform-tools and users should use Android
Studio Profiler instead. This addresses confusion around the
deprecated systrace command-line tool while maintaining the
documentation for the Systrace API in React Native.

Changes:
- Added deprecation notice for standalone systrace tool
- Clarified that Android Studio Profiler is the recommended alternative
- Improved documentation clarity for developers migrating from systrace

Author: AbhishekGiri04

docs/profiling.md

@@ -15,6 +15,10 @@ Android supports 10k+ different phones and is generalized to support software re
 
 The first step for debugging this jank is to answer the fundamental question of where your time is being spent during each 16ms frame. For that, we'll be using the [built-in System Tracing profiler in the Android Studio](https://developer.android.com/studio/profile).
 
+:::note
+The standalone `systrace` tool has been removed from Android platform-tools. Use the Android Studio Profiler instead, which provides the same functionality with a better user interface.
+:::
+
 ### 1. Collecting a trace
 
 First, connect a device that exhibits the stuttering you want to investigate to your computer via USB. Open your project's `android` folder in Android Studio, select your device in the top right pane, and [run your project as profileable](https://developer.android.com/studio/profile#build-and-run).