feat(regtest): Add regtest halving interval and port test (#8888) #1958

Job	Run time
Generate crates matrix	13s
Check crates matrix	2s
Build zebrad crate	38m 26s
Build zebra-utils crate	16m 59s
Build zebra-test crate	1m 32s
Build zebra-state crate	22m 36s
Build zebra-script crate	3m 30s
Build zebra-scan crate	27m 3s
Build zebra-rpc crate	35m 32s
Build zebra-node-services crate	3m 16s
Build zebra-network crate	7m 16s
Build zebra-grpc crate	14m 53s
Build zebra-consensus crate	17m 31s
Build zebra-chain crate	4m 55s
Build tower-fallback crate	1m 4s
Build tower-batch-control crate	1m 26s
Open or update issues for building crates individually failures	0s
	3h 16m 14s

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