FEATURE: Add setting to show who marked as solved (#347)

This commit adds the site setting `SiteSetting.show_who_marked_solved` and also the following tooltip to answer posts.

assets/javascripts/discourse/components/solved-unaccept-answer-button.gjs

@@ -1,11 +1,14 @@
 import Component from "@glimmer/component";
 import { action } from "@ember/object";
 import { service } from "@ember/service";
+import { htmlSafe } from "@ember/template";
 import DButton from "discourse/components/d-button";
 import icon from "discourse/helpers/d-icon";
 import { ajax } from "discourse/lib/ajax";
 import { popupAjaxError } from "discourse/lib/ajax-error";
+import { formatUsername } from "discourse/lib/utilities";
 import { i18n } from "discourse-i18n";
+import DTooltip from "float-kit/components/d-tooltip";
 
 export function unacceptAnswer(post, appEvents) {
   // TODO (glimmer-post-menu): Remove this exported function and move the code into the button action after the widget code is removed
@@ -41,23 +44,61 @@ function unacceptPost(post) {
 
 export default class SolvedUnacceptAnswerButton extends Component {
   @service appEvents;
+  @service siteSettings;
 
   @action
   unacceptAnswer() {
     unacceptAnswer(this.args.post, this.appEvents);
   }
 
+  get solvedBy() {
+    if (!this.siteSettings.show_who_marked_solved) {
+      return;
+    }
+
+    const username = this.args.post.topic.accepted_answer.accepter_username;
+    const name = this.args.post.topic.accepted_answer.accepter_name;
+    const displayedName =
+      this.siteSettings.display_name_on_posts && name
+        ? name
+        : formatUsername(username);
+    if (this.args.post.topic.accepted_answer.accepter_username) {
+      return i18n("solved.marked_solved_by", {
+        username: displayedName,
+        username_lower: username,
+      });
+    }
+  }
+
   <template>
     <span class="extra-buttons">
       {{#if @post.can_unaccept_answer}}
-        <DButton
-          class="post-action-menu__solved-accepted accepted fade-out"
-          ...attributes
-          @action={{this.unacceptAnswer}}
-          @icon="square-check"
-          @label="solved.solution"
-          @title="solved.unaccept_answer"
-        />
+        {{#if this.solvedBy}}
+          <DTooltip @identifier="post-action-menu__solved-accepted-tooltip">
+            <:trigger>
+              <DButton
+                class="post-action-menu__solved-accepted accepted fade-out"
+                ...attributes
+                @action={{this.unacceptAnswer}}
+                @icon="square-check"
+                @label="solved.solution"
+                @title="solved.unaccept_answer"
+              />
+            </:trigger>
+            <:content>
+              {{htmlSafe this.solvedBy}}
+            </:content>
+          </DTooltip>
+        {{else}}
+          <DButton
+            class="post-action-menu__solved-accepted accepted fade-out"
+            ...attributes
+            @action={{this.unacceptAnswer}}
+            @icon="square-check"
+            @label="solved.solution"
+            @title="solved.unaccept_answer"
+          />
+        {{/if}}
       {{else}}
         <span
           class="accepted-text"

assets/javascripts/discourse/initializers/extend-for-solved-button.js

@@ -195,6 +195,9 @@ export default {
       accepterHtml: computed("accepted_answer", function () {
         const username = this.get("accepted_answer.accepter_username");
         const name = this.get("accepted_answer.accepter_name");
+        if (!this.siteSettings.show_who_marked_solved) {
+          return "";
+        }
         const formattedUsername =
           this.siteSettings.display_name_on_posts && name
             ? name