ref(workflows): consolidate workflows based on their purpose #4

Job	Run time
Check deny.toml bans	39s
Check Cargo.lock is up to date	1m 55s
Check deny.toml bans --features default-release-binaries	32s
Check deny.toml bans --all-features	33s
Check deny.toml sources	36s
Install zebrad from lockfile without cache on ubuntu-latest	18m 48s
Check deny.toml sources --features default-release-binaries	41s
Check deny.toml sources --all-features	34s
Test stable on ubuntu-latest	1h 5m 49s
Check for unused dependencies	21s
Test stable on ubuntu-latest --features getblocktemplate-rpcs	1h 15m 19s
Test beta on ubuntu-latest	54m 17s
Build CI Docker / Build images	1h 2m 7s
Test all with getblocktemplate-rpcs feature	1h 15m 28s
Test with fake activation heights	14m 0s
Test checkpoint sync from empty state	19m 51s
Test all	1h 3m 5s
Test Zebra default Docker config file	3m 11s
Test integration with lightwalletd	19m 10s
Test Zebra custom Docker config file	1m 41s
	7h 58m 37s

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