[misc] cleanup imports and useless code

...it/org/xwiki/administration/test/ui/ForgotUsernameIT.java

...ki/administration/test/po/ForgotUsernameCompletePage.java

...ministration/test/po/ThemesAdministrationSectionPage.java

...t/org/xwiki/appwithinminutes/test/ui/AppsLiveTableIT.java

...xwiki/appwithinminutes/test/po/ApplicationCreatePage.java

...g/xwiki/appwithinminutes/test/po/ApplicationEditPage.java

...a/org/xwiki/classloader/AttachmentURLClassLoaderTest.java

...nt/wiki/DefaultWikiComponentManagerEventListenerTest.java

.../servlet/internal/DefaultServletContainerInitializer.java

...crypto/store/wiki/internal/DefaultSignatureStoreTest.java

...pto/store/wiki/internal/X509CertificateWikiStoreTest.java

...wiki/crypto/store/wiki/internal/X509KeyWikiStoreTest.java

...tstream/internal/DefaultRecordableEventConverterTest.java

...UntypedRecordableEventDescriptorComponentBuilderTest.java

...on/distribution/internal/job/step/FirstAdminUserStep.java

...ternal/delete/question/ExtensionBreakingQuestionTest.java

...i/extension/xar/script/XarExtensionScriptServiceTest.java

...rg/xwiki/extension/test/po/ExtensionDependenciesPane.java

...ernal/output/ExtensionInstanceOutputFilterStreamTest.java

...er/src/test/it/org/xwiki/flamingo/test/docker/EditIT.java