test: another attempt to stabilize grid-pro test

[vursen]

There was sometimes a second focus call originating from:

web-components/packages/grid/src/vaadin-grid-mixin.js

Lines 795 to 807 in e34b3ba

	_onAnimationEnd(e) {
	// ShadyCSS applies scoping suffixes to animation names
	if (e.animationName.indexOf('vaadin-grid-appear') === 0) {
	e.stopPropagation();
	// Ensure header and footer have tabbable elements
	this._resetKeyboardNavigation();
	requestAnimationFrame(() => {
	this.__scrollToPendingIndexes();
	});
	}
	}

The PR updates the tests to wait for this animation to finish before any interactions.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[vaadin-bot]

This ticket/PR has been released with Vaadin 24.7.0.alpha7 and is also targeting the upcoming stable 24.7.0 version.