Currently there are special logic that pulls the font file from https://storage.googleapis.com/flutter_infra/flutter/fonts as a tool artifact cache, and a special yaml entry lets the tool add it to the flx.

Use the generic logic used in Cupertino to host a new package on pub that user apps can add dependencies on to indirectly get the font instead. See #12559 for Cupertino. See #12160 for mechanism.

Remove special logic from tools.