remove wallaby and yoga due to ubuntu 20.04 deprecation (#425) #177

Job	Run time
Deploy OpenStack bobcat and run integration tests with php 8.1	12m 45s
Deploy OpenStack zed and run integration tests with php	15m 26s
Deploy OpenStack caracal and run integration tests with php	13m 33s
Deploy OpenStack antelope and run integration tests with php	14m 8s
Deploy OpenStack dalmatian and run integration tests with php	17m 3s
	1h 12m 55s

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