fix: waiter#RunAndWait maybe cause deadlock.

[liruohrh]

for errChan cap is 1 and receive both event timeout err and callback err( block on the err for errChan handle receiving(wait#waitFunc) after callback send err(waiter#RunAndWait) ).

my solution of old code fix ( ExpectFileChooser )

code which maybe cause deadlock

	uploadFileTimeout := 30 * 1000.0
	fileChooser, err := page.ExpectFileChooser(func() error {
		err = page.Locator(".fileChooser-trigger").Click(playwright.LocatorClickOptions{
			Timeout: playwright.Float(40 * 1000),
		})
		if err != nil {
			return fmt.Errorf("trigger fileChooser: %w", err)
		}
		return nil
	}, playwright.PageExpectFileChooserOptions{
		Timeout: playwright.Float(uploadFileTimeout),
	})
	if err := fileChooser.SetFiles(filepaths); err != nil {
		return "", fmt.Errorf("set files: %w", err)
	}

solution

	stopped := false
	defer func() {
		stopped = true
	}()
	topContext := context.Background()
	uploadFileTimeout := 30 * time.Second
	ctx, cancel := context.WithTimeout(topContext, uploadFileTimeout)
	defer cancel()
	var once sync.Once
	fileChooserCh := make(chan playwright.FileChooser)
	page.OnFileChooser(func(chooser playwright.FileChooser) {
		once.Do(func() {
			if stopped {
				return
			}
			fileChooserCh <- chooser
		})
	})
	err = page.Locator(".fileChooser-trigger").Click(playwright.LocatorClickOptions{
		Timeout: playwright.Float(40 * 1000),
	})
	if err != nil {
		stopped = true
		return "", fmt.Errorf("trigger fileChooser: %w", err)
	}
	select {
	case <-ctx.Done():
		stopped = true
		return "", fmt.Errorf("wait file chooser: %w", playwright.ErrTimeout)
	case fileChooser := <-fileChooserCh:
		if err := fileChooser.SetFiles(filepaths); err != nil {
			return "", fmt.Errorf("set files: %w", err)
		}
	}

[liruohrh]

solution2

	var triggerErr error
	fileChooser, err := page.ExpectFileChooser(func() error {
	        err := page.Locator(".fileChooser-trigger").Click(playwright.LocatorClickOptions{
		        Timeout: playwright.Float(40 * 1000),
	        })
		if err != nil {
			triggerErr = fmt.Errorf("click upload file button: %w", err)
		}
		return nil
	}, playwright.PageExpectFileChooserOptions{
		Timeout: playwright.Float(30000),
	})
	if err != nil {
		if triggerErr != nil {
			err = fmt.Errorf("wait file chooser: %w: %w", err, triggerErr)
		}
		return fmt.Errorf("wait file chooser: %w", err)
	}
	err = fileChooser.SetFiles(filepaths)
	if err != nil {
		return fmt.Errorf("set files: %w", err)
	}

[liruohrh]

@canstand
I pull a request to fix fail test of TestPageExpectWorker in #561.