Rollback persisted configuration on blob store add/modify failures #1440
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When adding or modifying a blob store, if an exception occurs after the configuration has been persisted to disk, the stored XML file could be left in an invalid state that prevents application startup on restart.
This prevents GeoServer to store invalid blob store configurations, for as long as the BlobStore throws UnsuitableStorageException, in order not to change the current logic.
This fix ensures that if save() or handleAddBlobStore()/handleModifyBlobStore() fail, the persisted configuration is rolled back by re-saving the previous valid state. Makes loadConfiguration() package-private with @VisibleForTesting to allow tests to verify the persisted state matches expectations after rollback.