DEV: Modernize user card connector and resolve deprecations (#96)

Removes deprecated `parentView` access, and `getOwner`

assets/javascripts/discourse-user-notes/connectors/user-card-post-names/show-user-notes-on-card.gjs

@@ -0,0 +1,54 @@
+import Component from "@glimmer/component";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import DButton from "discourse/components/d-button";
+import emoji from "discourse/helpers/emoji";
+import icon from "discourse-common/helpers/d-icon";
+import I18n from "I18n";
+import { showUserNotes } from "discourse/plugins/discourse-user-notes/discourse-user-notes/lib/user-notes";
+
+export default class extends Component {
+  static shouldRender(args, context) {
+    const { siteSettings, currentUser } = context;
+    return siteSettings.user_notes_enabled && currentUser?.staff;
+  }
+
+  @service siteSettings;
+  @service currentUser;
+  @service store;
+
+  get userNotesCount() {
+    return parseInt(
+      this.args.outletArgs.user.get("user_notes_count") ||
+        this.args.outletArgs.user.get("custom_fields.user_notes_count") ||
+        0,
+      10
+    );
+  }
+
+  @action
+  showUserNotes() {
+    showUserNotes(this.store, this.args.outletArgs.user.id);
+  }
+
+  <template>
+    <div class="show-user-notes-on-card">
+      {{#if this.userNotesCount}}
+        <DButton
+          @translatedTitle={{I18n.t
+            "user_notes.show"
+            count=this.userNotesCount
+          }}
+          @action={{this.showUserNotes}}
+          class="btn-flat"
+        >
+          {{#if this.siteSettings.enable_emoji}}
+            {{emoji "pencil"}}
+          {{else}}
+            {{icon "sticky-note"}}
+          {{/if}}
+        </DButton>
+      {{/if}}
+    </div>
+  </template>
+}