Make `keystore_vs_validator_set` test generic over the keystore about bls HOT 4 CLOSED

This test is using the test toolbox developped in the keystore.rs and I can't compile this before
first making the keystore tests generic over the keystore. so I'm puting this on hold and migrate the keystore tests, first.

from bls.

Migrated. passing for ecdsa but failing for ecdsa_n_bls. investigating.

from bls.

The problem arise verify_validator_set using btree to find intersections between keystor.public_keys and the validator_sets and the public_keys and in ecdsa_n_bls no intersection is found.

from bls.

Was due to test function create_beefy_keystore which was only creates ecdsa keys.

DONE in 744fe4239a8

from bls.