Export wikitext.mediawiki.validation to satisfy internal reference #626

Task-Url:
https://github.com/eclipse-mylyn/org.eclipse.mylyn/issues/issues/626

!ENTRY org.eclipse.equinox.registry 4 1 2024-10-12 11:42:30.861
!MESSAGE Plug-in org.eclipse.mylyn.wikitext.mediawiki.ui was unable to
load class
org.eclipse.mylyn.wikitext.mediawiki.internal.validation.MediaWikiReferenceValidationRule.
!STACK 0
java.lang.ClassNotFoundException:
org.eclipse.mylyn.wikitext.mediawiki.internal.validation.MediaWikiReferenceValidationRule
cannot be found by
org.eclipse.mylyn.wikitext.mediawiki.ui_4.5.0.v20241002-1142

Author: gnl42

mylyn.docs/wikitext/core/org.eclipse.mylyn.wikitext.mediawiki/META-INF/MANIFEST.MF

@@ -20,4 +20,5 @@ Export-Package: org.eclipse.mylyn.wikitext.mediawiki;version="4.5.0";x-friends:=
  org.eclipse.mylyn.wikitext.mediawiki.internal;version="4.5.0";x-friends:="org.eclipse.mylyn.wikitext.mediawiki.ant",
  org.eclipse.mylyn.wikitext.mediawiki.internal.block;version="4.5.0";x-internal:=true;uses:="org.eclipse.mylyn.wikitext.parser.markup,org.eclipse.mylyn.wikitext.parser.markup.block,org.eclipse.mylyn.wikitext.parser.outline",
  org.eclipse.mylyn.wikitext.mediawiki.internal.phrase;version="4.5.0";x-internal:=true;uses:="org.eclipse.mylyn.wikitext.parser,org.eclipse.mylyn.wikitext.parser.markup",
- org.eclipse.mylyn.wikitext.mediawiki.internal.token;version="4.5.0";x-internal:=true;uses:="org.eclipse.mylyn.wikitext.parser.markup"
+ org.eclipse.mylyn.wikitext.mediawiki.internal.token;version="4.5.0";x-internal:=true;uses:="org.eclipse.mylyn.wikitext.parser.markup",
+ org.eclipse.mylyn.wikitext.mediawiki.internal.validation;x-internal:=true