[vm] Don't acquire safepoint locks while participating in reload safepoints.

Also disable lint intended to guard against use of std::thread::detach as it has too many false positives against dart::FinalizerEntry::detach.

TEST=ci
Bug: https://github.com/dart-lang/sdk/issues/60638
Change-Id: I19a0fde743fc5c5658a8dd96cecb5b074481a035
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/425324
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

runtime/vm/dart_api_impl.cc

@@ -742,6 +742,7 @@ DART_EXPORT bool Dart_IsError(Dart_Handle handle) {
 DART_EXPORT void Dart_KillIsolate(Dart_Isolate handle) {
   Isolate* isolate = reinterpret_cast<Isolate*>(handle);
   CHECK_ISOLATE(isolate);
+  TransitionNativeToVM transition(Thread::Current());
   Isolate::KillIfExists(isolate, Isolate::kKillMsg);
 }