[Enhancement]: Update defaults in proxy

[palango]

Use case and current behavior

Some proxy options default to old versions

    --storage.backends-to-enable value  (default: "V1")                    ($EIGENDA_PROXY_STORAGE_BACKENDS_TO_ENABLE)
          Comma separated list of eigenDA backends to enable (e.g. V1,V2)

    --storage.dispersal-backend value   (default: "V1")                    ($EIGENDA_PROXY_STORAGE_DISPERSAL_BACKEND)
          Target EigenDA backend version for blob dispersal (e.g. V1 or V2).

Enhancement

Those should default to V2

Solution proposal

No response

Additional Information

docker image version ghcr.io/layr-labs/eigenda-proxy:2.6.0-rc.2