Add Sepolia tests for BLS #1007

Job	Run time
test eth2near/contract_wrapper	40s
test eth2near/eth2-to-near-block-relay-rs	2m 27s
test eth2near/finality-update-verify	2m 57s
build rust contracts	3m 4s
test eth-prover	2m 5s
test eth2near/eth_rpc_client	2m 55s
test eth2near/eth2-contract-init	3m 3s
test eth2-client	8m 47s
	25m 58s

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