Add automated acceptance tests for cmd_exec API #4

Job	Run time
python 3.6 macos-12	2m 32s
python 3.11 macos-12	2m 38s
java 8 macos-12	46m 51s
java 21 macos-12	37m 56s
php 5.3 macos-12	3m 35s
php 7.4 macos-12	3m 30s
php 8.3 macos-12	3m 22s
python 3.6 windows-2019	19m 7s
python 3.11 windows-2019	18m 23s
java 8 windows-2019	20m 10s
java 21 windows-2019	19m 15s
php 5.3 windows-2019	22m 41s
php 7.4 windows-2019	18m 27s
php 8.3 windows-2019	17m 50s
python 3.6 ubuntu-20.04	1m 43s
python 3.11 ubuntu-20.04	1m 33s
java 8 ubuntu-20.04	3m 24s
java 21 ubuntu-20.04	3m 48s
php 5.3 ubuntu-20.04	1m 35s
php 7.4 ubuntu-20.04	1m 32s
php 8.3 ubuntu-20.04	1m 54s
windows_meterpreter windows-2019	20m 23s
windows_meterpreter windows-2022	14m 55s
mettle macos-12	18m 54s
mettle ubuntu-20.04	19m 52s
Generate report	41s
	5h 26m 31s

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