Fix running backup and restore plugin #395

Job	Run time
build-geoserver-docker-image (2, 9.0.91-jdk17-temurin-focal, /opt/java/openjdk, 26, 1, https://so...	3m 30s
build-activemq-docker-image	31s
run-scenario-tests (gwc)	2m 7s
run-scenario-tests (login)	4m 39s
run-scenario-tests (stores)	2m 37s
run-scenario-tests (context)	2m 19s
run-scenario-tests (disk-quota)	2m 7s
run-scenario-tests (jdbconfig)	3m 23s
run-scenario-tests (libjpeg)	1m 23s
scan_image	2m 16s
push-internal-pr-images	41s
	25m 33s

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