Enable detectAsyncLeaks in Vitest tests (#7616)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: siddharthkp <1863771+siddharthkp@users.noreply.github.com>
Co-authored-by: Marie Lucca <40550942+francinelucca@users.noreply.github.com>

Author: 3 people

packages/doc-gen/vitest.config.mts

@@ -6,5 +6,6 @@ export default defineConfig({
   },
   test: {
     environment: 'node',
+    detectAsyncLeaks: true,
   },
 })

packages/postcss-preset-primer/vitest.config.ts

@@ -3,5 +3,6 @@ import {defineConfig} from 'vitest/config'
 export default defineConfig({
   test: {
     environment: 'node',
+    detectAsyncLeaks: true,
   },
 })

packages/react/vitest.config.mts

@@ -25,5 +25,6 @@ export default defineConfig({
     name: '@primer/react (node)',
     include: ['src/__tests__/exports.test.ts', 'src/__tests__/storybook.test.tsx'],
     environment: 'node',
+    detectAsyncLeaks: true,
   },
 })

packages/styled-react/vitest.config.ts

@@ -5,5 +5,6 @@ export default defineConfig({
     name: '@primer/styled-react (node)',
     environment: 'node',
     exclude: ['src/**/*.browser.test.?(c|m)[jt]s?(x)'],
+    detectAsyncLeaks: true,
   },
 })