DEV: enforces ember-template-lint: no-html-comments (#9183)

https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-html-comments.md

.template-lintrc.js

@@ -13,6 +13,7 @@ module.exports = {
     "no-unbound": true,
     "simple-unless": true,
     "no-triple-curlies": true,
-    "no-partial": true
+    "no-partial": true,
+    "no-html-comments": true
   }
 };

app/assets/javascripts/admin/templates/modal/admin-badge-preview.hbs

@@ -4,7 +4,7 @@
 
     <pre class="badge-errors">{{errors}}</pre>
 
-    <!--
+    {{!--
       TODO we want some help pages for this, link to those instead
       <p>
         {{i18n "admin.badges.preview.error_help"}}
@@ -12,7 +12,7 @@
       <ul>
         <li><a href="https://meta.discourse.org/t/triggered-custom-badge-queries/19336">https://meta.discourse.org/t/triggered-custom-badge-queries/19336</a></li>
       </ul>
-    -->
+    --}}
 
   {{else}}
     <p class="grant-count">

app/assets/javascripts/discourse/templates/components/search-advanced-options.hbs

@@ -24,7 +24,7 @@
   </div>
 </div>
 
-<!-- disable these super-advanced searches for now
+{{!-- disable these super-advanced searches for now
 <div class="container">
   <div class="control-group pull-left">
     <label class="control-label" for="search-in-group">{{i18n "search.advanced.in_group.label"}}</label>
@@ -38,8 +38,7 @@
       {{badge-selector badgeFinder=badgeFinder badgeNames=searchedTerms.badge single="true" canReceiveUpdates="true"}}
     </div>
   </div>
-</div>
+</div> --}}
--->
 
 {{#if siteSettings.tagging_enabled}}
   <div class="container advanced-search-tag-group">