[web] enable mongo notablescan in CI (#29501)

* [monorepo] record ERROR/FATAL log messages in junit report

* [web] put SaaS specific code behind feature flag

* [web] use split test cache for getting user assignments

The unit tests needed updating as they did not replicate any of the
 mongo filtering. The acceptance tests cover this logic.

* [web] make better use of existing indexes

* [web] avoid col-scan in tests of notifications module

* [web] remove cleanup of empty feedbacks collection

* [web] add assertion for reason of rejected request in launchpad test

* [web] add missing indexes

* [web] enable mongo notablescan

* [web] make emailNotifications tests compatible with notablescan

GitOrigin-RevId: b888f2feeb3a0e915f068ae1c4ea23ec17821221

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

@@ -232,12 +232,11 @@ async function getActiveAssignmentsForUser(
     return {}
   }
 
-  const splitTests = await SplitTest.find({
-    $where: 'this.versions[this.versions.length - 1].active',
-    ...(removeArchived && { archived: { $ne: true } }),
-  }).exec()
+  const splitTests = (await SplitTestCache.get('')).values()
   const assignments = {}
   for (const splitTest of splitTests) {
+    if (!splitTest.versions[splitTest.versions.length - 1].active) continue
+    if (removeArchived && splitTest.archived) continue
     const { activeForUser, selectedVariantName, phase, versionNumber } =
       await _getAssignmentMetadata(user.analyticsId, user, splitTest)
     if (activeForUser) {