improve: remove fabric8 related daily build #5135

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	2m 40s
sample_operators_tests (sample-operators/mysql-schema)	2m 30s
sample_operators_tests (sample-operators/leader-election)	3m 4s
sample_operators_tests (sample-operators/webpage)	2m 56s
	11m 10s

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