[bug] Add missing group property to the Account model (#3746)

* Stub out account's Group parameter

* Fix typo in Contributing documentation

* Update swagger and match style

* Update the swagger command to mimic test/swagger.sh

* Fix tests for new `group` param in Account model

* More test changes for new `group` param in Account

* Continuing test changes for `group` param stubbing

* Another round of `group` stubbing for tests

internal/api/client/statuses/statushistory_test.go

@@ -120,7 +120,8 @@ func (suite *StatusHistoryTestSuite) TestGetHistory() {
       "last_status_at": "2024-11-01",
       "emojis": [],
       "fields": [],
-      "enable_rss": true
+      "enable_rss": true,
+      "group": false
     },
     "poll": null,
     "media_attachments": [],