Make Livewire work with full measure static caching

[aerni]

This PR makes it possible to use Livewire together with full measure static caching. It ensures that the STATAMIC_CSRF_TOKEN placeholder is replaced when the cached page is loaded.

Why this is needed

Statamic replaces all token occurrences in the CsrfTokenReplacer:

cms/src/StaticCaching/Replacers/CsrfTokenReplacer.php

Lines 29 to 33 in 509bd70

	$response->setContent(str_replace(
	$token,
	self::REPLACEMENT,
	$content
	));

So Livewire doesn't have a valid token to work with:

Which results in this error when interacting with the Livewire component after a cached page is loaded:

With this PR, the livewire_token is replaced and the error is gone:

[what-the-diff]

PR Summary

• Added a new condition to the getNocacheJs() function
  This change ensures that window.livewire_token is set to data.csrf properly, enhancing the security and reliability of the application.

[jasonvarga]

Is half measure broken when using livewire?

[aerni]

No, Half Measure works because it's hitting PHP and replaces the STATAMIC_CSRF_TOKEN placeholder here:

cms/src/StaticCaching/Replacers/CsrfTokenReplacer.php

Lines 36 to 47 in 87d643f

	public function replaceInCachedResponse(Response $response)
	{
	if (! $response->getContent()) {
	return;
	}
	$response->setContent(str_replace(
	self::REPLACEMENT,
	csrf_token(),
	$response->getContent()
	));
	}