fix: remove staging plugin from bom module #5305

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 2s
sample_operators_tests (sample-operators/tomcat-operator)	2m 51s
sample_operators_tests (sample-operators/leader-election)	3m 22s
sample_operators_tests (sample-operators/mysql-schema)	2m 48s
	12m 3s

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