fix: exit(0) causes ANR due to destroyed mutex (#1820)

Co-authored-by: Eduardo Speroni <[email protected]>

test-app/runtime/src/main/cpp/MetadataNode.cpp

@@ -1918,7 +1918,7 @@ void MetadataNode::BuildMetadata(const string& filesPath) {
             // startup because the receiver is triggered.  So even though we are exiting, the receiver will have
             // done its job
 
-            exit(0);
+            _Exit(0);
         }
         else {
           throw NativeScriptException(ss.str());