fix: revert vitest config to single process for integration tests

Author: coopernetes

vitest.config.ts

@@ -2,6 +2,12 @@ import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {
+    pool: 'forks',
+    poolOptions: {
+      forks: {
+        singleFork: true, // Run all tests in a single process
+      },
+    },
     coverage: {
       provider: 'v8',
       reportsDirectory: './coverage',