v8: rename promise tracker function to be consistent across engines

Author: ammarahm-ed

test-app/app/src/main/assets/internal/ts_helpers.js

@@ -422,7 +422,7 @@
 
   if (globalThis.__engine === "V8") {
     // Only report errors for promise rejections that go unhandled.
-    globalThis.__v8UnhandledPromiseRejectionTracker = (
+    globalThis.onUnhandledPromiseRejectionTracker = (
       event,
       promise,
       reason

test-app/runtime/src/main/cpp/napi/v8/jsr.cpp

@@ -96,7 +96,7 @@ napi_status js_create_napi_env(napi_env *env, napi_runtime runtime) {
             v8::Local<v8::Context> context = isolate->GetCurrentContext();
             Local<Object> global = context->Global();
             Local<Value> callback = global->Get(context, String::NewFromUtf8(isolate,
-                                                                             "__v8UnhandledPromiseRejectionTracker").ToLocalChecked()).ToLocalChecked();
+                                                                             "onUnhandledPromiseRejectionTracker").ToLocalChecked()).ToLocalChecked();
             if (value.IsEmpty())
                 value = Undefined(isolate);
             Local<Value> args[] = {event, promise, value};