- move cctest/test-parsing -> unittests/parser/parsing-unittest
- move common/{scope-test-helper, unicode-helper} to unittests/parser
  directory because these are only be used by tests in unittests/parser


Bug: v8:12781
Change-Id: Ie0fb043d5df6178bbe088d140a76f606454bbf29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3855313Reviewed-by: Marja Hölttä <marja@chromium.org>
Commit-Queue: Feng Yu <f3n67u@gmail.com>
Cr-Commit-Position: refs/heads/main@{#82837}