chore: remove unused env vars and duplicates from turbo.json globalEnv (#27400)

Remove 7 environment variables no longer referenced in the codebase:
- NEXT_PUBLIC_CONSOLE_URL
- NEXT_PUBLIC_STRIPE_PRICING_TABLE_PUBLISHABLE_KEY
- NEXT_PUBLIC_PLAIN_CHAT_EXCLUDED_PATHS
- NEXT_PUBLIC_VERCEL_ENV
- NEXT_PUBLIC_VERCEL_BRANCH_URL
- PRISMA_FIELD_ENCRYPTION_KEY
- PRISMA_GENERATE_DATAPROXY

Deduplicate 6 entries that appeared twice in globalEnv:
- CALCOM_CREDENTIAL_SYNC_SECRET
- INTERCOM_SECRET
- NEXT_PUBLIC_ORG_SELF_SERVE_ENABLED
- ORG_MONTHLY_CREDITS
- STRIPE_ORG_PRODUCT_ID
- VAPID_PRIVATE_KEY

Also removes the unused vars from .env.example.

Reduces globalEnv from 321 to 308 entries, lowering the surface
for unnecessary Turbo cache invalidation.

.env.example

@@ -33,12 +33,6 @@ DATABASE_URL="postgresql://postgres:@localhost:5450/calendso"
 DATABASE_DIRECT_URL="postgresql://postgres:@localhost:5450/calendso"
 INSIGHTS_DATABASE_URL=
 
-# Uncomment to enable a dedicated connection pool for Prisma using Prisma Data Proxy
-# Cold boots will be faster and you'll be able to scale your DB independently of your app.
-# @see https://www.prisma.io/docs/data-platform/data-proxy/use-data-proxy
-# PRISMA_GENERATE_DATAPROXY=true
-PRISMA_GENERATE_DATAPROXY=
-
 # ***********************************************************************************************************
 
 # - SHARED **************************************************************************************************
@@ -47,7 +41,6 @@ PRISMA_GENERATE_DATAPROXY=
 NEXT_PUBLIC_WEBAPP_URL='http://localhost:3000'
 # Change to 'http://localhost:3001' if running the website simultaneously
 NEXT_PUBLIC_WEBSITE_URL='http://localhost:3000'
-NEXT_PUBLIC_CONSOLE_URL='http://localhost:3004'
 NEXT_PUBLIC_EMBED_LIB_URL='http://localhost:3000/embed/embed.js'
 
 # To enable SAML login, set both these variables