fix(54465): Broken emit with private field in class decorator

[a-tarasyuk]

Fixes #54465

#54465 (comment)

[rbuckton]

I think what we should be looking at is lookupSymbolForPrivateIdentifierDeclaration. Right now it just uses getContainingClass(location) which does not skip over the immediately containing class of a class decorator.

We need something more like:

function getContainingClassExcludingClassDecorators(node: Node) {
  const decorator = findAncestor(node.parent, n => isClassLike(n) ? "quit" : isDecorator(n));
  if (decorator && isClassLike(decorator.parent)) return getContainingClass(decorator.parent);
  return getContainingClass(decorator ?? node);
}

Which would then replace the first getContainingClass call in lookupSymbolForPrivateIdentifierDeclaration.