Add automated test for "Name strategies automatic character replacement validation"

Note that this test is now covered by https://github.com/xwiki/xwiki-platform/blob/5e67cd7cd2a31a8a21aa5298dbe9f373b0157665/xwiki-platform-core/xwiki-platform-model/xwiki-platform-model-validation/xwiki-platform-model-validation-test/xwiki-platform-model-validation-test-docker/src/test/it/org/xwiki/model/validation/test/ui/docker/NameStrategiesIT.java#L52

The only thing not currently covered is that the default strategy is the replacement strategy and configured with "/" and "\" by default.