ref(workflows): consolidate workflows based on their purpose #37

Job	Run time
Check Cargo.lock is up to date	1m 54s
Install zebrad from lockfile without cache on ubuntu-latest	17m 18s
Check for unused dependencies	16s
Check deny.toml bans	37s
Test stable on ubuntu-latest	28m 57s
Test stable on ubuntu-latest --features getblocktemplate-rpcs	28m 58s
Check deny.toml bans --features default-release-binaries	40s
Test beta on ubuntu-latest	28m 56s
Check deny.toml bans --all-features	36s
Check deny.toml sources	36s
Check deny.toml sources --features default-release-binaries	37s
Check deny.toml sources --all-features	38s
Open or update issues for OS integration failures	1s
	1h 50m 4s

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