Prysm: disable bzlmod

[prestonvanloon]

This PR disables bzlmod which seems to be rate limiting or banning the builder.

Error in download: java.io.IOException: Error downloading [https://bcr.bazel.build/modules/rules_cc/0.0.9/patches/module_dot_bazel_version.patch] to /data/gh-home/.cache/bazel/_bazel_root/e06669d813ee8962af5ff3fbbdf856de/external/rules_cc~/.tmp_remote_patches/module_dot_bazel_version.patch: GET returned 403 Forbidden

A long term solution is to cache the bazel build directories or use a remote cache with --experimental-remote-downloader=grpc://$REMOTE_CACHE and --remote_cache=grpc://$REMOTE_CACHE. This would fetch the remote dependencies from the remote cache box as a proxy and cache any interim build steps. You won't bomb / get banned from dependency providers and build times should increase significantly when builds haven't changed much.

Edit: I meant the --experimental_remote_asset_api flag