Prior to this, when used in conjunction with e.g. `format-all-mode`,
garbage like
node: NODE_STRING@[8934; 9139), indent: IndentLevel { level: 3, alignment: 0 }
would be written to the file.
Changes the default fetcher in the Rust Platform to be the newer
`fetchCargoTarball`, and changes every application using the current default to
instead opt out.
This commit does not change any hashes or cause any rebuilds. Once integrated,
we will start deleting the opt-outs and recomputing hashes.
See #79975 for details.
