Enable withdrawals only for Eth mainnet #1750

Job	Run time
Test evm_arithmetization	11m 11s
Test mpt_trie	1m 41s
Test trace_decoder	3m 27s
Test proof_gen	2m 14s
Rustdoc, Formatting and Clippy	5m 25s
Execute bash script to generate and verify a proof for a small block.	6m 56s
Execute bash script to generate and verify a proof for multiple blocks using parallel proving.	5m 25s
Execute bash script to generate the proof witness for a small block.	1m 46s
Test zero_bin	13m 49s
Test zk_evm_proc_macro	54s
	52m 48s

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