Use filesystemStore bean instead of hardcoded class

[wangf1122]

The intention of this code change is to fix potential issue with harvesting file store. The current file store was hardcoded to FileSystemStore class instead of dynamic bean injection.

The similar fix was apply to this pull request which is already merged https://github.com/geonetwork/core-geonetwork/pull/8466/files

core-geonetwork/core/src/main/java/org/fao/geonet/util/XslUtil.java

Line 1249 in cd50ded

Store store = ApplicationContextHolder.get().getBean("filesystemStore", Store.class);

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