Add labels to call sequence #2064

Job	Run time
Build Echidna on ubuntu-20.04	5m 37s
Build Echidna on macos-13	6m 4s
Build Echidna on windows-latest	13m 52s
Test with solc 0.4.25 on ubuntu-latest	3m 18s
Test with solc 0.5.7 on ubuntu-latest	3m 22s
Test with solc 0.6.12 on ubuntu-latest	3m 40s
Test with solc 0.7.5 on ubuntu-latest	3m 26s
Test with solc 0.4.25 on windows-latest	3m 52s
Test with solc 0.5.7 on windows-latest	4m 13s
Test with solc 0.6.12 on windows-latest	5m 25s
Test with solc 0.7.5 on windows-latest	5m 9s
	57m 58s

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