test: drop the symfony/property-info 6.4 compatibility guards

[Maxcastel]

Q	A
Branch?	main
Tickets	n/a
License	MIT
Doc PR	n/a

Thirteen tests guarded their body behind a method_exists() check on PropertyInfoExtractor::getType(), with a comment claiming property-info 6.4 was still supported:

if (!method_exists(PropertyInfoExtractor::class, 'getType')) { // @phpstan-ignore-line symfony/property-info 6.4 is still allowed and this may be true
    $this->markTestSkipped('This test only supports type-info component');
}

symfony/property-info is constrained to ^7.4 || ^8.0 in the root and in the components that require it, and getType() is present and undeprecated on both bounds:

public function getType(string $class, string $property, array $context = []): ?Type  // 7.4 line 57, 8.1 line 56

https://github.com/symfony/property-info/blob/7.4/PropertyInfoExtractor.php
https://github.com/symfony/property-info/blob/8.1/PropertyInfoExtractor.php

So the guard always evaluates to true and none of those could run.