ref(workflows): consolidate workflows based on their purpose #38

Job	Run time
Check Cargo.lock is up to date	1m 56s
Test stable on ubuntu-latest	27m 45s
Install zebrad from lockfile without cache on ubuntu-latest	16m 36s
Test stable on ubuntu-latest --features getblocktemplate-rpcs	27m 45s
Test beta on ubuntu-latest	27m 44s
Check deny.toml bans	39s
Check for unused dependencies	22s
Check deny.toml bans --features default-release-binaries	34s
Check deny.toml bans --all-features	41s
Check deny.toml sources	53s
Check deny.toml sources --features default-release-binaries	40s
Check deny.toml sources --all-features	34s
Open or update issues for OS integration failures	1s
	1h 46m 10s

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