go/types,types2: move notinheap tests to fixedbugs directory

go/types,types2: move notinheap tests to fixedbugs directory

So they can be added to ignored list, since the tests now require
cgo.Incomplete, which is not recognized by go/types and types2.

Updates #46731

Change-Id: I9f24e3c8605424d1f5f42ae4409437198f4c1326
Reviewed-on: https://go-review.googlesource.com/c/go/+/427142
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>