improve: remove fabric8 daily build #5133

Job	Run time
sample_operators_tests (sample-operators/webpage)	2m 52s
sample_operators_tests (sample-operators/tomcat-operator)	2m 29s
sample_operators_tests (sample-operators/mysql-schema)	2m 37s
sample_operators_tests (sample-operators/leader-election)	3m 20s
	11m 18s

Provide feedback