ref(workflows): consolidate workflows based on their purpose #28

Job	Run time
Check Cargo.lock is up to date	1m 45s
Check deny.toml bans	32s
Install zebrad from lockfile without cache on ubuntu-latest	16m 6s
Check deny.toml bans --features default-release-binaries	32s
Check deny.toml bans --all-features	32s
Test stable on ubuntu-latest	57m 22s
Check for unused dependencies	26s
Check deny.toml sources	39s
Test stable on ubuntu-latest --features getblocktemplate-rpcs	1h 0m 19s
Check deny.toml sources --features default-release-binaries	41s
Test beta on ubuntu-latest	1h 3m 45s
Check deny.toml sources --all-features	32s
Open or update issues for OS integration failures	0s
	3h 23m 11s

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