Add automated acceptance tests for cmd_exec API #16

Job	Run time
python 3.6 macos-12	2m 46s
python 3.11 macos-12	3m 15s
java 8 macos-12	4m 52s
java 21 macos-12	3m 13s
php 5.3 macos-12	3m 31s
php 7.4 macos-12	3m 7s
php 8.3 macos-12	3m 18s
python 3.6 windows-2019	7m 6s
python 3.11 windows-2019	4m 58s
java 8 windows-2019	6m 6s
java 21 windows-2019	5m 8s
php 5.3 windows-2019	6m 40s
php 7.4 windows-2019	5m 39s
php 8.3 windows-2019	5m 13s
python 3.6 ubuntu-20.04	1m 40s
python 3.11 ubuntu-20.04	2m 7s
java 8 ubuntu-20.04	1m 27s
java 21 ubuntu-20.04	1m 42s
php 5.3 ubuntu-20.04	1m 38s
php 7.4 ubuntu-20.04	1m 27s
php 8.3 ubuntu-20.04	1m 27s
windows_meterpreter windows-2019	4m 51s
windows_meterpreter windows-2022	5m 16s
mettle macos-12	2m 19s
mettle ubuntu-20.04	1m 39s
Generate report	1m 28s
	1h 31m 53s

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