Add basic groupSchema test

app/soapbox/__fixtures__/group-truthsocial.json

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+{
+  "note": "patriots 900000001",
+  "discoverable": true,
+  "id": "109989480368015378",
+  "domain": null,
+  "avatar": "https://media.covfefe.social/groups/avatars/109/989/480/368/015/378/original/50b0d899bc5aae13.jpg",
+  "avatar_static": "https://media.covfefe.social/groups/avatars/109/989/480/368/015/378/original/50b0d899bc5aae13.jpg",
+  "header": "https://media.covfefe.social/groups/headers/109/989/480/368/015/378/original/c5063b59f919cd4a.png",
+  "header_static": "https://media.covfefe.social/groups/headers/109/989/480/368/015/378/original/c5063b59f919cd4a.png",
+  "group_visibility": "everyone",
+  "created_at": "2023-03-08T00:00:00.000Z",
+  "display_name": "PATRIOT PATRIOTS",
+  "membership_required": true,
+  "members_count": 1,
+  "tags": []
+}

app/soapbox/schemas/__tests__/group.test.ts

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+import { groupSchema } from '../group';
+
+test('groupSchema with a TruthSocial group', () => {
+  const data = require('soapbox/__fixtures__/group-truthsocial.json');
+  const group = groupSchema.parse(data);
+  expect(group.display_name_html).toEqual('PATRIOT PATRIOTS');
+});