Fix `jquery-integration` optional feature flag to only throw when explicitly enabled.
Fix `jquery-integration` optional feature flag to only throw when explicitly enabled.

tildeio/ember.js,tildeio/ember.js,mixonic/ember.js,sly7-7/ember.js,emberjs/ember.js,emberjs/ember.js,sly7-7/ember.js,sly7-7/ember.js,mixonic/ember.js,mixonic/ember.js,tildeio/ember.js,emberjs/ember.js