Add automated acceptance tests for cmd_exec API #13

Job	Run time
python 3.6 macos-12	3m 30s
python 3.11 macos-12	2m 38s
java 8 macos-12	3m 29s
java 21 macos-12	4m 22s
php 5.3 macos-12	3m 20s
php 7.4 macos-12	3m 34s
php 8.3 macos-12	3m 5s
python 3.6 windows-2019	4m 56s
python 3.11 windows-2019	4m 27s
java 8 windows-2019	4m 6s
java 21 windows-2019	4m 28s
php 5.3 windows-2019	4m 6s
php 7.4 windows-2019	3m 41s
php 8.3 windows-2019	3m 44s
python 3.6 ubuntu-20.04	1m 41s
python 3.11 ubuntu-20.04	1m 48s
java 8 ubuntu-20.04	1m 47s
java 21 ubuntu-20.04	6m 47s
php 5.3 ubuntu-20.04	1m 38s
php 7.4 ubuntu-20.04	1m 45s
php 8.3 ubuntu-20.04	1m 19s
windows_meterpreter windows-2019	4m 57s
windows_meterpreter windows-2022	4m 38s
mettle macos-12	2m 17s
mettle ubuntu-20.04	1m 55s
Generate report	33s
	1h 24m 31s

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