XWIKI-9389: Allow configuring the entity path prefix in the new URL module

...e/xwiki-platform-legacy/xwiki-platform-legacy-url/pom.xml

...url/internal/standard/LegacyStandardURLConfiguration.java

...com/xpn/xwiki/internal/web/XWikiConfigurationService.java

...oldcore/src/main/java/com/xpn/xwiki/web/ActionFilter.java

...rc/main/java/com/xpn/xwiki/web/XWikiRequestProcessor.java

...re/xwiki-platform-url/xwiki-platform-url-standard/pom.xml

...rl/internal/standard/DefaultStandardURLConfiguration.java

...l/internal/standard/ExtendedURLXWikiEntityURLFactory.java

...xwiki/url/internal/standard/StandardURLConfiguration.java

...nternal/standard/DefaultStandardURLConfigurationTest.java

...ternal/standard/ExtendedURLXWikiEntityURLFactoryTest.java

...guration-resources/src/main/resources/xwiki.properties.vm