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This clarifies dependency on test filter data, since
it is only used by the "test" template.

Also, it paves the path for building v8 on Fuchsia
standalone: the "fuchsia_package_runner" template
can be used directly in v8 repo, and in v8-only
checkout.

Change-Id: Ibe171c48ee818cc5b722294f682f83c3ae240908
Reviewed-on: https://chromium-review.googlesource.com/1180731Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Dimitri Glazkov <dglazkov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586056}