CHIA-1198 Add an end to end test for mempool bundle fill rate and the resulting block validation

[AmineKhaldi]

We try to create a mempool bundle with the maximum fill rate possible and ensure the resulting block would still pass block validation.

[arvidn]

looks good. would you mind adding a comment to the custom cost limit you set, explaining why you pick that specific number?
Also, is there a way to assert the cost of the block as well? I expect it to be different from the transaction cost, but it would be good to have the test ensure it doesn't change

[AmineKhaldi]

looks good. would you mind adding a comment to the custom cost limit you set, explaining why you pick that specific number? Also, is there a way to assert the cost of the block as well? I expect it to be different from the transaction cost, but it would be good to have the test ensure it doesn't change

I added a comment to explain the custom cost limit.

As to getting the block cost, I issued a RequestBlock to get a FullBlock and check the cost in its TransactionsInfo.