DEV: Convert merge-users modals to component-based API (#22727)

app/assets/javascripts/admin/addon/components/modal/merge-users-confirmation.js

@@ -0,0 +1,18 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import I18n from "I18n";
+
+export default class MergeUsersConfirmation extends Component {
+  @tracked value;
+
+  get mergeDisabled() {
+    return !this.value || this.text !== this.value;
+  }
+
+  get text() {
+    return I18n.t("admin.user.merge.confirmation.text", {
+      username: this.args.model.username,
+      targetUsername: this.args.model.targetUsername,
+    });
+  }
+}