fix(lint): enable @typescript-eslint/await-thenable rule (#12644)

* fix(lint): enable await-thenable rule and fix violation

- Enable @typescript-eslint/await-thenable rule (off -> error)
- Remove unnecessary await on syncTraceEvent() which returns void

* Update rslint.json

---------

Co-authored-by: neverland <jait.chen@foxmail.com>

Author: tt-a1i

packages/rspack/src/exports.ts

@@ -416,7 +416,7 @@ export const experiments: Experiments = {
     },
     async cleanup() {
       await JavaScriptTracer.cleanupJavaScriptTrace();
-      await syncTraceEvent(JavaScriptTracer.events);
+      syncTraceEvent(JavaScriptTracer.events);
       cleanupGlobalTrace();
     },
   },

rslint.json

@@ -27,7 +27,6 @@
       "@typescript-eslint/use-unknown-in-catch-callback-variable": "off",
       "@typescript-eslint/require-await": "off",
       "@typescript-eslint/switch-exhaustiveness-check": "off",
-      "@typescript-eslint/await-thenable": "off",
       "@typescript-eslint/return-await": "off",
       "@typescript-eslint/non-nullable-type-assertion-style": "off",
       "@typescript-eslint/no-misused-spread": "off",