[post-gloas] configuration cleanup

remove constants from config file that are there for compatibility - these need to remain for fulu.

1.7.0-alpha.3
 - `ATTESTATION_SUBNET_PREFIX_BITS`
 - `MAX_REQUEST_BLOB_SIDECARS`
 - `MAX_REQUEST_BLOB_SIDECARS_ELECTRA`
 - `MAX_REQUEST_DATA_COLUMN_SIDECARS`
 - `MIN_EPOCHS_FOR_BLOCK_REQUESTS`
 - `SECONDS_PER_SLOT`