fix(jni): ensure that the ScopesAdapter instance is released after use (#3411)

* refactor(sentry_native_java): streamline options retrieval in addBreadcrumb and setUser methods

This commit refactors the SentryNativeJava class to improve the retrieval of native options in the addBreadcrumb and setUser methods. The changes ensure that the ScopesAdapter instance is obtained once and used consistently, enhancing code clarity and reducing redundancy. Additionally, null checks are maintained to prevent potential runtime errors.

* Update CHANGELOG

Author: buenaflor

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Fixes
 
 - Cold/warm start spans not attaching if TTFD takes more than 3 seconds to report ([#3404](https://github.com/getsentry/sentry-dart/pull/3404))
+- Ensure that the JNI `ScopesAdapter` instance is released after use ([#3411](https://github.com/getsentry/sentry-dart/pull/3411))
 
 ## 9.9.0
 

packages/flutter/lib/src/native/java/sentry_native_java.dart

@@ -189,9 +189,11 @@ class SentryNativeJava extends SentryNativeChannel {
   void addBreadcrumb(Breadcrumb breadcrumb) =>
       tryCatchSync('addBreadcrumb', () {
         using((arena) {
-          final nativeOptions = native.ScopesAdapter.getInstance()?.getOptions()
+          final scopesAdapter = native.ScopesAdapter.getInstance()
             ?..releasedBy(arena);
-          if (nativeOptions == null) return;
+          if (scopesAdapter == null) return;
+          final nativeOptions = scopesAdapter.getOptions()..releasedBy(arena);
+
           final jMap = dartToJMap(breadcrumb.toJson());
           final nativeBreadcrumb =
               native.Breadcrumb.fromMap(jMap, nativeOptions)
@@ -214,10 +216,10 @@ class SentryNativeJava extends SentryNativeChannel {
           if (user == null) {
             native.Sentry.setUser(null);
           } else {
-            final nativeOptions = native.ScopesAdapter.getInstance()
-                ?.getOptions()
+            final scopesAdapter = native.ScopesAdapter.getInstance()
               ?..releasedBy(arena);
-            if (nativeOptions == null) return;
+            if (scopesAdapter == null) return;
+            final nativeOptions = scopesAdapter.getOptions()..releasedBy(arena);
 
             final jMap = dartToJMap(user.toJson());
             final nativeUser = native.User.fromMap(jMap, nativeOptions)