Don't check read permission for sidebar link

Theres no need, because the user wouldn't be viewing
the build page if they didn't have the required read permission.

Related: JENKINS-46540

blueocean-rest-impl/src/main/resources/io/jenkins/blueocean/service/embedded/BlueOceanUrlAction/action.jelly

@@ -5,6 +5,5 @@
     </j:if>
     <l:task icon="${h.getIconFilePath(action)}" title="${action.displayName}"
             href="${rootURL}/${action.urlName}"
-            permission="${app.READ}"
     />
 </j:jelly>