Relax split test import schema to allow staging export fields (#36832)

* Relax split test import schema to allow staging export fields

The staging split test export includes fields (variant.active, version.__v,
splitTest.customerIoEnabled) that aren't otherwise written by the app but
are present in Mongo exports. The strict zod schema was rejecting the
import; mark these as optional so a staging export can be imported into a
local dev environment.

* [web] allow split-test import in dev-env and CI

* [web] ensure that the zod schema for split-tests covers all fields

---------

Co-authored-by: Thomas Mees <thomas.mees@overleaf.com>
GitOrigin-RevId: eab633e8498e351a64dc9a9dad85759e80744da0

services/web/app/src/Features/SplitTests/SplitTestManager.mjs

@@ -4,6 +4,7 @@ import SplitTestUtils from './SplitTestUtils.mjs'
 import OError from '@overleaf/o-error'
 import _ from 'lodash'
 import { CacheFlow } from 'cache-flow'
+import Settings from '@overleaf/settings'
 
 // customer.io silently drops attribute values over 1000 bytes, so cap the
 // number of split tests whose assignments are sent in the
@@ -594,11 +595,12 @@ async function _saveSplitTest(splitTest) {
 }
 
 /*
- * As this is only used for utility in local dev environment, we should make sure this isn't run in
- * any other deployment environment.
+ * As this is only used for utility in local dev environment (and the test
+ * suites), we should make sure this isn't run in any other deployment
+ * environment.
  */
 function _checkEnvIsSafe(operation) {
-  if (process.env.NODE_ENV !== 'development') {
+  if (!Settings.isDevEnv && !Settings.isCI) {
     throw new Errors.ForbiddenError(
       `Attempted to ${operation} all feature flags outside of local env`
     )