Update test validator in docker and blockbuster version

[danenbm]

Notes

• Update prepare-local-docker-env script to download programs from mainnet rather than build locally from a downloaded tag.
• Update test validator image in docker compose file.
• Update blockbuster to use a beta release from the blockbuster update-metadata-staging branch.
• Also update to latest Bubblegum beta release which is what the blockbuster release uses.

Testing

Tested a clean build and observed it can build and run in docker, and NFTs will be periodically minted.

./prepare-local-docker-env.sh
docker compose up --force-recreate --build

[Juanito87]

Besides the comment, LGTM