test(react): wait for hmr update to reduce flakyness

[sapphi-red]

Description

The following test failed some times in the following condition

vite-plugin-react/playground/react/__tests__/react.spec.ts

Lines 74 to 94 in ce0de3e

	test('should only hmr files with exported react components', async () => {
	await untilBrowserLogAfter(
	() =>
	editFile('hmr/no-exported-comp.jsx', (code) =>
	code.replace('An Object', 'Updated'),
	),
	[
	new RegExp(
	`^${escapeRegex(
	'[vite] invalidate /hmr/no-exported-comp.jsx: Could not Fast Refresh ("Foo" export is incompatible). Learn more at https://github.com/vitejs/vite-plugin-react/tree/main/packages/',
	)}plugin-react(?:-\\w+)?${escapeRegex(
	'#consistent-components-exports',
	)}`,
	),
	'[vite] hot updated: /hmr/no-exported-comp.jsx',
	'[vite] hot updated: /hmr/parent.jsx',
	'Parent rendered',
	],
	)
	await untilUpdated(() => page.textContent('#parent'), 'Updated')
	})

• these edits were executed fast enough to be processed in a single update:
  

  vite-plugin-react/playground/react/__tests__/react.spec.ts

  Lines 49 to 51 in a758bfe

  	editFile('App.jsx', (code) =>
  	code.replace('<div className="App"}>', '<div className="App">'),
  	)

  
  

  vite-plugin-react/playground/react/__tests__/react.spec.ts

  Lines 73 to 75 in a758bfe

  	editFile('hmr/no-exported-comp.jsx', (code) =>
  	code.replace('An Object', 'Updated'),
  	),

In that case, allExportsAreComponentsOrUnchanged probably becomes true because of prevExports[key] === nextExports[key], and import.meta.hot.invalidate won't be called.

vite-plugin-react/packages/common/refresh-runtime.js

Line 615 in a758bfe

const allExportsAreComponentsOrUnchanged = predicateOnExport(

---

This PR fixes that flaky fail by waiting for the update to be processed.