fix: run flaky tests on GitHub action

[bonyuta0204]

Description

Woriking in Progress.
Trying to address #4464

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[sheremet-va]

I think the flakiness in files that rely on watch mode might be due to the watcher incorrectly emitting ready event too soon. You can try incorporating the utility I wrote for Vite tests from here: https://github.com/sheremet-va/vite/blob/4df5ac29087f448a40f80707dec78d197e74c6d2/playground/hmr-ssr/__tests__/hmr.spec.ts#L960

We already check for a ready event with an env variable for tests (maybe it can be improved with the utility here):

vitest/packages/vite-node/src/hmr/emitter.ts

Line 54 in 8877e22

if (process.env.VITE_TEST_WATCHER_DEBUG) {

vitest/packages/vitest/src/node/plugins/index.ts

Line 181 in 8877e22

if (options.watch && process.env.VITE_TEST_WATCHER_DEBUG) {

[bonyuta0204]

Thank you for your advice!
I will check it out!