DEV: Update linting setup and fix issues (#17345)

Re-lands #16119 and #17298

* Update eslint-config-discourse
* Update linting workflow
* Prettier-ignore stuff
* Update template-lint config
* Auto-fix template issues
* Fix various template issues
  Mostly incorrect attributes and unused templates
* Prettier js files
* Fix template auto-fix regressions
* Small css tweak

Co-authored-by: Peter Wagenet <peter.wagenet@gmail.com>

plugins/poll/assets/javascripts/initializers/extend-for-poll.js

@@ -24,8 +24,8 @@ function cleanUpPolls() {
 
 function initializePolls(api) {
   const register = getRegister(api),
-    pollGroupableUserFields = api.container.lookup("site-settings:main")
-      .poll_groupable_user_fields;
+    pollGroupableUserFields =
+      api.container.lookup("site-settings:main").poll_groupable_user_fields;
   cleanUpPolls();
 
   api.modifyClass("controller:topic", {