feat(zendesk): add zendesk integration (#1385)

* feat(zendesk): add zendesk integration

* Add Zendesk connection documentation

* docs(zendesk/connection): add missing steps

* feat(zendesk): add more auth scopes for planned triggers/actions

* fix(zendesk): fix instanceUrl

---------

Co-authored-by: Ali BARIN <ali.barin53@gmail.com>

packages/backend/src/apps/zendesk/common/add-auth-headers.ts

@@ -0,0 +1,17 @@
+import { TBeforeRequest } from '@automatisch/types';
+
+const addAuthHeader: TBeforeRequest = ($, requestConfig) => {
+  const { instanceUrl, tokenType, accessToken } = $.auth.data;
+
+  if (instanceUrl) {
+    requestConfig.baseURL = instanceUrl as string;
+  }
+
+  if (tokenType && accessToken) {
+    requestConfig.headers.Authorization = `${tokenType} ${$.auth.data.accessToken}`;
+  }
+
+  return requestConfig;
+};
+
+export default addAuthHeader;