The default for `use_cfv2` is now `true`. Tests may opt-out by setting
it to `false.` Tests are still built/run as CFv1 components if:
- They use fuchsia.sys.Launcher (skia_unittests and gfx_unittests).
- They use additional_manifest_fragments (many).
These will be migrated to CFv2 as their fragments (and their respective
required capabilities) are migrated to CFv2.
Bug: 1256502
Change-Id: I3ef514d997da29bf4ce80d17b7afa57bbdb107e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3447303
Reviewed-by: Wez <wez@chromium.org>
Owners-Override: Wez <wez@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/main@{#968954}