Enable using nonce style-src based CSP with components

[tepi]

Describe your motivation

Starting from 24.5 Flow has made it possible to use strict CSP rules with a nonce. It would be great if this was possible for styles as well using style-src with nonce.

Describe the solution you'd like

To enable this, web components should inject the nonce value to all style tags. The nonce value (if in use) is made available by Flow in window.Vaadin.Flow.nonce. When the value is undefined, no action is needed.

Describe alternatives you've considered

Could not find a workaround to do this from Flow side.

Additional context

No response