download font-subset

[dnfield]

Description

consume font subsetting tools when caching artifacts.

This adds roughtly 2.5 mb of download, and about 6mb of additional cache overhead (font-subset executable is just over half a meg, const_finder snapshot is about 5.5 megs).

This also prints out a more friendly name for repeated tool artifacts, e.g. instead of repeatedly printing out darwin-x64 tools, it will print things like darwin-x64/font-subset (unless it's for the artifacts.zip archive, in which case it will print the old string).

Related Issues

#43642
#43644

Tests

I added the following tests:

Test that the new artifact does the expected things on various platforms: provide right paths on Windows/Mac/Linux, throw on other OS.

Test for friendly string logging.

Checklist

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• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I signed the CLA.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.
• The analyzer (flutter analyze --flutter-repo) does not report any problems on my PR.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Did any tests fail when you ran them? Please read Handling breaking changes.

• No, no existing tests failed, so this is not a breaking change.

[jonahwilliams]

LGTM

[christopherfujino]

LGTM