[12.x] Ignore querystring parameters using closure when validating signed url

[gdebrauwer]

If you want to ignore all utm querystring parameters when validating a signed url, you currently have to provide all those utm parameters in an array:

$request->hasValidSignatureWhileIgnoring(['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'])

This PR makes that easier by allowing you to provide a closure to determine which querystring parameters should be ignored:

$request->hasValidSignatureWhileIgnoring(fn ($parameter) => Str::startsWith($parameter, 'utm_'));