fix partialUpdate test code smells #5230

Job	Run time
build-matrix	9s
ng-default (n20.11.0/j17)	2s
ng-default-additional (n20/j21)	2s
ng-mysql-es-noi18n-mapsid (n20/j17)	1s
ng-mongodb-kafka-cucumber (n20.11.0/j21)	1s
ng-h2mem-ws-nol2 (n20.11.0/j17)	2s
ng-gradle-fr (n20/j21)	2s
ng-gradle-mariadb-oauth2-infinispan (n20/j17)	2s
ng-gradle-h2disk-ws-nocache (n20.11.0/j21)	2s
ng-webflux-mongodb (n20.11.0/j17)	1s
ng-webflux-gradle-mongodb-oauth2 (n20/j21)	1s
ng-webflux-psql-default (n20.11.0/j17)	1s
ng-webflux-psql-additional (n20/j21)	1s
ng-webflux-gradle-session-h2mem-es (n20/j17)	1s
ms-ng-consul-oauth2-mongodb-caffeine (n20.11.0/j17)	2s
mf-ng-eureka-jwt-psql-ehcache (n20/j21)	2s
ms-mf-ng-consul-oauth2-neo4j (n20/j17)	2s
check-angular	1s
	35s

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