Iterate emoji color font tests over more color font formats

In the meantime we support more than one format per platform. Make the
emoji font instantiation in FontToolUtils more flexible. And instantiate
3 emoji tests with more color font formats.

Required preparation for testing more bitmap font support in the
Fontations backend.

Bug: skia:40045335
Cq-Include-Trybots: luci.skia.skia.primary:Build-Debian10-Clang-x86_64-Debug-Fontations,Build-Mac-Clang-x86_64-Debug-Fontations,Test-Debian10-Clang-GCE-CPU-AVX2-x86_64-Debug-All-Fontations,Test-Mac12-Clang-MacBookPro16.2-CPU-AppleIntel-x86_64-Debug-All-Fontations
Change-Id: I6af32e64fd7f2ff0d62f755cf6010c908d97ce34
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/820736
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Ben Wagner <bungeman@google.com>
11 files changed