inspector: throw ERR_INSPECTOR_NOT_AVAILABLE without an agent

An Environment created with kNoCreateInspector threw a bare string from
inspector.Session#connect(), inspector.open() and the other Agent entry
points, so callers could not tell the condition apart by error code. Use
the ERR_INSPECTOR_NOT_AVAILABLE code that connectToMainThread() already
throws for the same situation.

Signed-off-by: Shelley Vohr <shelley.vohr@gmail.com>
PR-URL: #66239
Refs: #65977
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: codebytere

src/inspector_agent.cc

@@ -512,15 +512,8 @@ bool IsFilePath(const std::string& path) {
 #endif  // __POSIX__
 
 void ThrowUninitializedInspectorError(Environment* env) {
-  HandleScope scope(env->isolate());
-
-  std::string_view msg =
-      "This Environment was initialized without a V8::Inspector";
-  Local<Value> exception;
-  if (ToV8Value(env->context(), msg, env->isolate()).ToLocal(&exception)) {
-    env->isolate()->ThrowException(exception);
-  }
-  // V8 will have scheduled a superseding error here.
+  THROW_ERR_INSPECTOR_NOT_AVAILABLE(
+      env, "This Environment was initialized without a V8::Inspector");
 }
 
 }  // namespace