[Web] Enable Quota System for AI Features (#31544)

* feat: migrate from aiErrorAssist naming for disabling AI features to aiFeatures.enabled to avoid confusion

feat: keep aiErrorAssistant as setting on user object until migration is run

* feat: migrate writefull.enabled unset to instead use promotionSet false

* feat: updating to use quota based system for AI usage

* feat: hide relevant sections of quota system behind split test

* feat: ship onAiFreeTrial instead of free quota amount to project meta

* fix: renaming splitTestEnabledForUser to featureFlagEnabledForUser

* fix: v1_personal should have free trial amount of ai quota

* fix: onAiFreeTrial in projectController should account for anonymous users with no features

* feat: fixing marketing exports for ai quotas

* feat: update features epoch

* feat: move to quota tiers, and map tier to numeric allowance within rateLimiters

GitOrigin-RevId: 17763447965aae5777053b783d2601517bfe6b12

services/web/test/unit/src/Subscription/FeaturesUpdater.test.mjs

@@ -74,6 +74,11 @@ describe('FeaturesUpdater', function () {
       },
       writefull: {
         overleafApiUrl: 'https://www.writefull.com',
+        quotaTierGranted: 'unlimited',
+      },
+      aiFeatures: {
+        freeTrialQuota: 'basic',
+        unlimitedQuota: 'unlimited',
       },
     }
 
@@ -323,6 +328,7 @@ describe('FeaturesUpdater', function () {
           default: 'features',
           individual: 'features',
           aiErrorAssistant: true,
+          aiUsageQuota: 'unlimited',
         })
       })
     })
@@ -341,6 +347,7 @@ describe('FeaturesUpdater', function () {
         expect(features).to.deep.equal({
           default: 'features',
           aiErrorAssistant: true,
+          aiUsageQuota: 'unlimited',
         })
       })
     })