While the package is broken and does not build, we can still recompute the
cargoSha256. I attempted to upgrade to the latest release, but that doesn't
build either.
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.
