Add automated acceptance tests for cmd_exec API #21

Job	Run time
python 3.6 macos-12	2m 44s
python 3.11 macos-12	3m 2s
java 8 macos-12	3m 34s
java 21 macos-12	3m 26s
php 5.3 macos-12	3m 29s
php 7.4 macos-12	3m 22s
php 8.3 macos-12	4m 15s
python 3.6 windows-2019	5m 51s
python 3.11 windows-2019	4m 0s
java 8 windows-2019	4m 38s
java 21 windows-2019	3m 37s
php 5.3 windows-2019	5m 30s
php 7.4 windows-2019	3m 42s
php 8.3 windows-2019	3m 45s
python 3.6 ubuntu-20.04	1m 42s
python 3.11 ubuntu-20.04	1m 35s
java 8 ubuntu-20.04	1m 30s
java 21 ubuntu-20.04	1m 36s
php 5.3 ubuntu-20.04	1m 51s
php 7.4 ubuntu-20.04	1m 28s
php 8.3 ubuntu-20.04	1m 25s
windows_meterpreter windows-2019	9m 9s
windows_meterpreter windows-2022	5m 14s
mettle macos-12	2m 37s
mettle ubuntu-20.04	1m 41s
Generate report	30s
	1h 25m 13s

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