feat: Add support for markdown in messages (#1642)

Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/shared/mixins/specs/messageFormatterMixin.spec.js

@@ -0,0 +1,17 @@
+import { shallowMount } from '@vue/test-utils';
+import messageFormatterMixin from '../messageFormatterMixin';
+
+describe('messageFormatterMixin', () => {
+  it('returns correct plain text', () => {
+    const Component = {
+      render() {},
+      mixins: [messageFormatterMixin],
+    };
+    const wrapper = shallowMount(Component);
+    const message =
+      '<b>Chatwoot is an opensource tool. https://www.chatwoot.com</b>';
+    expect(wrapper.vm.getPlainText(message)).toMatch(
+      'Chatwoot is an opensource tool. https://www.chatwoot.com'
+    );
+  });
+});