FIX: Ensure there is no limit on tag list settings (#17355)

`maximum=null` is not a supported configuration option. Instead, we need to pass the `@unlimitedTagCount` attribute

app/assets/javascripts/admin/addon/templates/components/site-settings/tag-list.hbs

@@ -1,6 +1,5 @@
-<TagChooser @tags={{this.selectedTags}} @onChange={{action "changeSelectedTags"}} @everyTag={{true}} @options={{hash
+<TagChooser @tags={{this.selectedTags}} @onChange={{action "changeSelectedTags"}} @everyTag={{true}} @unlimitedTagCount={{true}} @options={{hash
     allowAny=false
-    maximum=null
   }} />
 <div class="desc">{{html-safe this.setting.description}}</div>
 <SettingValidationMessage @message={{this.validationMessage}} />