Add automated acceptance tests for cmd_exec API #20

Job	Run time
python 3.6 macos-12	2m 41s
python 3.11 macos-12	2m 52s
java 8 macos-12	3m 11s
java 21 macos-12	3m 1s
php 5.3 macos-12	3m 32s
php 7.4 macos-12	4m 2s
php 8.3 macos-12	3m 7s
python 3.6 windows-2019	6m 13s
python 3.11 windows-2019	4m 11s
java 8 windows-2019	4m 55s
java 21 windows-2019	4m 55s
php 5.3 windows-2019	5m 43s
php 7.4 windows-2019	3m 33s
php 8.3 windows-2019	3m 33s
python 3.6 ubuntu-20.04	1m 48s
python 3.11 ubuntu-20.04	1m 35s
java 8 ubuntu-20.04	1m 26s
java 21 ubuntu-20.04	1m 29s
php 5.3 ubuntu-20.04	1m 30s
php 7.4 ubuntu-20.04	1m 29s
php 8.3 ubuntu-20.04	1m 25s
windows_meterpreter windows-2019	6m 28s
windows_meterpreter windows-2022	5m 47s
mettle macos-12	2m 21s
mettle ubuntu-20.04	1m 43s
Generate report	1m 4s
	1h 23m 34s

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