Add labels to call sequence #2065

Job	Run time
Build Echidna on ubuntu-20.04	5m 33s
Build Echidna on macos-13	29m 30s
Build Echidna on windows-latest	9m 23s
Test with solc 0.4.25 on ubuntu-latest	3m 17s
Test with solc 0.5.7 on ubuntu-latest	3m 30s
Test with solc 0.6.12 on ubuntu-latest	3m 31s
Test with solc 0.7.5 on ubuntu-latest	3m 51s
Test with solc 0.4.25 on windows-latest	3m 45s
Test with solc 0.5.7 on windows-latest	4m 22s
Test with solc 0.6.12 on windows-latest	3m 51s
Test with solc 0.7.5 on windows-latest	5m 9s
	1h 15m 42s

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