Add automated acceptance tests for cmd_exec API #22

Job	Run time
python 3.6 macos-12	2m 32s
python 3.11 macos-12	3m 10s
java 8 macos-12	3m 24s
java 21 macos-12	4m 21s
php 5.3 macos-12	3m 55s
php 7.4 macos-12	4m 5s
php 8.3 macos-12	3m 21s
python 3.6 windows-2019	6m 53s
python 3.11 windows-2019	5m 41s
java 8 windows-2019	4m 26s
java 21 windows-2019	4m 39s
php 5.3 windows-2019	5m 48s
php 7.4 windows-2019	5m 6s
php 8.3 windows-2019	4m 44s
python 3.6 ubuntu-20.04	1m 39s
python 3.11 ubuntu-20.04	1m 33s
java 8 ubuntu-20.04	1m 28s
java 21 ubuntu-20.04	1m 29s
php 5.3 ubuntu-20.04	1m 40s
php 7.4 ubuntu-20.04	1m 43s
php 8.3 ubuntu-20.04	1m 25s
windows_meterpreter windows-2019	5m 55s
windows_meterpreter windows-2022	5m 53s
mettle macos-12	2m 57s
mettle ubuntu-20.04	1m 38s
Generate report	30s
	1h 29m 55s

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