Add automated acceptance tests for cmd_exec API #50

Job	Run time
python 3.6 macos-12	2m 33s
python 3.11 macos-12	3m 12s
java 8 macos-12	3m 11s
java 21 macos-12	3m 27s
php 5.3 macos-12	3m 29s
php 7.4 macos-12	3m 13s
php 8.3 macos-12	2m 53s
python 3.6 windows-2019	4m 36s
python 3.11 windows-2019	3m 40s
java 8 windows-2019	3m 55s
java 21 windows-2019	5m 55s
php 5.3 windows-2019	5m 16s
php 7.4 windows-2019	3m 47s
php 8.3 windows-2019	3m 48s
python 3.6 ubuntu-20.04	1m 44s
python 3.11 ubuntu-20.04	1m 35s
java 8 ubuntu-20.04	1m 30s
java 21 ubuntu-20.04	1m 42s
php 5.3 ubuntu-20.04	1m 30s
php 7.4 ubuntu-20.04	1m 30s
php 8.3 ubuntu-20.04	1m 37s
windows_meterpreter windows-2019	6m 6s
windows_meterpreter windows-2022	5m 47s
mettle macos-12	3m 9s
mettle ubuntu-20.04	1m 37s
Generate report	39s
	1h 21m 21s

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