[feat] When selecting a block producer, only pick from the online delegates

[element0355]

Expected Behavior
When Selecting a block producer, only select ones that are online, if not, they are excluded from being picked as a block producer.

Current Behavior
DPoPS selects a block producer whether it is online or not. In the testnet this causes pauses in the blockchain, until it selects an online block producer. Currently not an issue on mainnet as we have enough delegates to fill in for the ones that fall offline.

Possible Solution
When selecting a block producer in the top 50 check if it is online, if not, exclude them from being able to produce the block.

[zachhildreth]

Hi @element0355
this is a great idea.

I have added it in the remote-data branch 0606313

we will test once we switch the testnet to this repo.

I forgot to add that issue to the commit so will come back and close the issue once we test it