fix: remove optional chaining in debug environment variable check (#6412

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* fix: remove optional chaining in debug environment variable check

Removed optional chaining from `globalThis?.process.env['DEBUG'] || globalThis.DEBUG` to ensure it runs on Cloudflare Workers.
 
The current implementation with optional chaining is flawed as it fails when `globalThis` is undefined, resulting in an error when accessing `process.env`. Although this change does not fully resolve the issue, it aligns with the requirement for Cloudflare Workers compatibility.

Ref: cloudflare/workers-sdk#6402

* Update packages/utils/src/debugTimer.ts

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Co-authored-by: Arda TANRIKULU <ardatanrikulu@gmail.com>

packages/utils/src/debugTimer.ts

@@ -1,7 +1,7 @@
 const debugNamesOngoing = new Set<string>();
 
 export function debugTimerStart(name: string) {
-  const debugEnvVar = globalThis?.process.env['DEBUG'] || (globalThis as any).DEBUG;
+  const debugEnvVar = globalThis.process?.env?.['DEBUG'] || (globalThis as any).DEBUG;
   if (debugEnvVar === '1' || debugEnvVar?.includes(name)) {
     debugNamesOngoing.add(name);
     console.time(name);