Add automated acceptance tests for cmd_exec API #23

Job	Run time
python 3.6 macos-12	2m 38s
python 3.11 macos-12	2m 42s
java 8 macos-12	3m 35s
java 21 macos-12	3m 6s
php 5.3 macos-12	3m 28s
php 7.4 macos-12	3m 9s
php 8.3 macos-12	2m 56s
python 3.6 windows-2019	6m 58s
python 3.11 windows-2019	4m 12s
java 8 windows-2019	4m 0s
java 21 windows-2019	3m 59s
php 5.3 windows-2019	5m 9s
php 7.4 windows-2019	3m 14s
php 8.3 windows-2019	3m 23s
python 3.6 ubuntu-20.04	1m 46s
python 3.11 ubuntu-20.04	1m 39s
java 8 ubuntu-20.04	1m 51s
java 21 ubuntu-20.04	1m 24s
php 5.3 ubuntu-20.04	1m 43s
php 7.4 ubuntu-20.04	1m 46s
php 8.3 ubuntu-20.04	1m 33s
windows_meterpreter windows-2019	10m 18s
windows_meterpreter windows-2022	5m 20s
mettle macos-12	2m 27s
mettle ubuntu-20.04	1m 52s
Generate report	45s
	1h 24m 53s

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