refactor: avoid unneeded initializations in injection contexts #5584

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	2m 35s
sample_operators_tests (sample-operators/leader-election)	5m 19s
sample_operators_tests (sample-operators/webpage)	3m 23s
sample_operators_tests (sample-operators/tomcat-operator)	2m 59s
	14m 16s

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