Make manifest parser scope patterns tests more extensive.

This is in preparation for extending the scope parsing functionality to
more fields and to allow strings to be passed in.

Bug: b/332982847
Change-Id: I7b40a88f3f15cedf3339d8897a4146a29e38679c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5426512


Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282974}