Add automated acceptance tests for cmd_exec API #18

Job	Run time
python 3.6 macos-12	2m 34s
python 3.11 macos-12	3m 39s
java 8 macos-12	4m 22s
java 21 macos-12	3m 9s
php 5.3 macos-12	3m 28s
php 7.4 macos-12	3m 45s
php 8.3 macos-12	3m 37s
python 3.6 windows-2019	6m 50s
python 3.11 windows-2019	6m 37s
java 8 windows-2019	5m 2s
java 21 windows-2019	3m 51s
php 5.3 windows-2019	6m 12s
php 7.4 windows-2019	4m 27s
php 8.3 windows-2019	4m 28s
python 3.6 ubuntu-20.04	2m 0s
python 3.11 ubuntu-20.04	1m 30s
java 8 ubuntu-20.04	1m 27s
java 21 ubuntu-20.04	1m 32s
php 5.3 ubuntu-20.04	1m 29s
php 7.4 ubuntu-20.04	1m 34s
php 8.3 ubuntu-20.04	1m 54s
windows_meterpreter windows-2019	7m 8s
windows_meterpreter windows-2022	7m 27s
mettle macos-12	3m 45s
mettle ubuntu-20.04	1m 58s
Generate report	27s
	1h 34m 12s

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