fixes https://github.com/flutter/flutter/issues/130682
This patch makes all zip files created via the zip_bundle rule have an embedded LICENSE that points to a permalink to the LICENSE for that SDK commit hash. Previously we only did this for a few tools, but it was pointed out that some of the zip files we generate that are meant for consumption in the tool are otherwise missing a stand-alone license file (the tool downloads the full license file separately from the individual zips, as it would be costly to include it with each and every one).