Fix running backup and restore plugin #399

Job	Run time
build-geoserver-docker-image (2, 9.0.91-jdk17-temurin-focal, /opt/java/openjdk, 26, 1, https://so...	2m 43s
build-activemq-docker-image	35s
run-scenario-tests (gwc)	1m 55s
run-scenario-tests (login)	2m 52s
run-scenario-tests (stores)	2m 43s
run-scenario-tests (context)	2m 31s
run-scenario-tests (disk-quota)	2m 5s
run-scenario-tests (jdbconfig)	3m 28s
run-scenario-tests (libjpeg)	1m 55s
run-scenario-tests (backup_restore)	2m 42s
scan_image	1m 18s
push-internal-pr-images	1m 12s
	25m 59s

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