ref(workflows): consolidate workflows based on their purpose #35

Job	Run time
Check deny.toml bans	48s
Check deny.toml bans --features default-release-binaries	39s
Check Cargo.lock is up to date	1m 49s
Check deny.toml bans --all-features	34s
Install zebrad from lockfile without cache on ubuntu-latest	5m 34s
Test stable on ubuntu-latest	5m 33s
Check deny.toml sources	40s
Test stable on ubuntu-latest --features getblocktemplate-rpcs	5m 32s
Check deny.toml sources --features default-release-binaries	31s
Check deny.toml sources --all-features	39s
Check for unused dependencies	26s
Test beta on ubuntu-latest	5m 33s
Open or update issues for OS integration failures	1s
	28m 19s

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