[ADP-3478] Remove get_latest_node_db_url (#4832)

This pull request removes the helper function `get_latest_node_db_url`
from the Ruby E2E tests.

### Issue Number

ADP-3478

test/e2e/helpers/utils.rb

@@ -152,19 +152,6 @@ def get_latest_configs_base_url(env)
       "https://book.world.dev.cardano.org/environments/#{env}/"
     end
 
-    ##
-    # Latest node-db snapshot updated at the end of every epoch
-    def get_latest_node_db_url(env)
-      raise "Unsupported env, supported are: 'mainnet' or 'testnet'" if (env != 'testnet') && (env != 'mainnet')
-
-      case env
-      when 'testnet'
-        'https://updates-cardano-testnet.s3.amazonaws.com/cardano-node-state/db-testnet.tar.gz'
-      when 'mainnet'
-        'https://update-cardano-mainnet.iohk.io/cardano-node-state/db-mainnet.tar.gz'
-      end
-    end
-
     ##
     # Get protocol magic from byron-genesis.json corresponding to particular env
     def get_protocol_magic(env)