Print comments for parenthesized TS keyword types (#12070)

* Prefer node.start for TS keyword types

* Add tests

* Add changelog

* Refactor

* Use isTsKeywordType

* Fix lint problems

changelog_unreleased/javascript/12070.md

@@ -0,0 +1,17 @@
+#### Print comments for parenthesized TS keyword types with `babel-ts` parser (#12070 by @sosukesuzuki)
+
+<!-- prettier-ignore -->
+```ts
+// Input
+let foo: (
+   // comment
+   never
+);
+
+// Prettier stable
+Error: Comment "comment" was not printed. Please report this error!
+
+// Prettier main
+let foo: // comment
+never;
+```