fix(OUT-2944-re): removed globalThis on base service

- globalThis was causing copilot instance to be shared, swapping global instances while calling copilot methods.
- The solution applied verifies a unique SDK instance for each service instance.

Author: arpandhakal

src/app/api/core/services/base.service.ts

@@ -3,12 +3,6 @@ import { CopilotAPI } from '@/utils/CopilotAPI'
 import User from '@api/core/models/User.model'
 import { PrismaClient } from '@prisma/client'
 
-declare global {
-  var copilot: CopilotAPI | undefined
-  var token: string | undefined
-  var copilotApiKey: string | undefined
-}
-
 /**
  * Base Service with access to db and current user
  */
@@ -21,16 +15,7 @@ export class BaseService {
   constructor(user: User, customCopilotApiKey?: string) {
     this.user = user
     this.customApiKey = customCopilotApiKey
-
-    // If token or copiltoApiKey mismatches, or global copilot instance is not present, create a new one.
-    // INFO: The token mismatch check is to make sure that fluid compute sharing serverless functions doesn't reuse the same SDK instance
-    if (globalThis.token !== user.token || globalThis.copilotApiKey !== customCopilotApiKey || !globalThis.copilot) {
-      globalThis.token = user.token
-      globalThis.copilotApiKey = customCopilotApiKey
-      globalThis.copilot = new CopilotAPI(user.token, customCopilotApiKey)
-    }
-
-    this.copilot = globalThis.copilot
+    this.copilot = new CopilotAPI(user.token)
   }
 
   setTransaction(tx: PrismaClient) {