XWIKI-22201: Add a "webjar" category

...nt-picker/xwiki-platform-attachment-picker-webjar/pom.xml

...a-jcaptcha/xwiki-platform-captcha-jcaptcha-webjar/pom.xml

...platform-ckeditor/xwiki-platform-ckeditor-plugins/pom.xml

...-platform-ckeditor/xwiki-platform-ckeditor-webjar/pom.xml

...age-lightbox/xwiki-platform-image-lightbox-webjar/pom.xml

...tform-index-tree/xwiki-platform-index-tree-webjar/pom.xml

...core/xwiki-platform-job/xwiki-platform-job-webjar/pom.xml

...-platform-livedata/xwiki-platform-livedata-webjar/pom.xml

...m-localization/xwiki-platform-localization-webjar/pom.xml

...notifications/xwiki-platform-notifications-webjar/pom.xml

...-platform-realtime/xwiki-platform-realtime-webjar/pom.xml

...realtime-wiki/xwiki-platform-realtime-wiki-webjar/pom.xml

...me-wysiwyg/xwiki-platform-realtime-wysiwyg-webjar/pom.xml

...wiki-platform-search/xwiki-platform-search-webjar/pom.xml

...re/xwiki-platform-tree/xwiki-platform-tree-webjar/pom.xml