CrOS Settings: Create storybook for settings-dropdown-row

Also updated the settings-dropdown-v2 storybook similarly.
Screenshot: http://screen/f36mTDrKPimWRUV.png

Bug: b:345010186
Test: Manually test UI
Change-Id: I8e5d8f8239bd229d293de7afa23767e3a0a0cbd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5599418


Reviewed-by: Connie Xu <conniekxu@chromium.org>
Commit-Queue: Wes Okuhara <wesokuhara@google.com>
Cr-Commit-Position: refs/heads/main@{#1312193}