[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/app/src/models/User.mjs

@@ -143,6 +143,7 @@ export const UserSchema = new Schema(
         type: Boolean,
         default: false,
       },
+      aiUsageQuota: { type: String, default: 'basic' },
     },
     featuresOverrides: [
       {
@@ -155,7 +156,9 @@ export const UserSchema = new Schema(
         expiresAt: { type: Date },
         note: { type: String },
         features: {
+          // todo: quota clean-up: remove aiErrorAssistant
           aiErrorAssistant: { type: Boolean },
+          aiUsageQuota: { type: String },
           collaborators: { type: Number },
           versioning: { type: Boolean },
           dropbox: { type: Boolean },