add(network-params): Allow configuring NU6 activation height on Regtest #1569

Job	Run time
Generate crates matrix	10s
Check crates matrix	2s
Build zebrad crate	37m 25s
Build zebra-utils crate	17m 4s
Build zebra-test crate	1m 31s
Build zebra-state crate	22m 49s
Build zebra-script crate	3m 28s
Build zebra-scan crate	27m 3s
Build zebra-rpc crate	34m 3s
Build zebra-node-services crate	3m 15s
Build zebra-network crate	7m 6s
Build zebra-grpc crate	15m 5s
Build zebra-consensus crate	17m 35s
Build zebra-chain crate	4m 57s
Build tower-fallback crate	57s
Build tower-batch-control crate	1m 19s
Open or update issues for building crates individually failures	0s
	3h 13m 49s

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