[PHPUnit60] Skip imported PHPUnit assert functions in AddDoesNotPerformAssertionToNonAssertingTestRector

[TomasVotruba]

Fixes rectorphp/rector#9848

AddDoesNotPerformAssertionToNonAssertingTestRector only looked for $this->assert*() method calls and self::assert*() static calls. Assertions called as standalone functions from the PHPUnit\Framework namespace were invisible to it, so tests using them were wrongly marked as non-asserting.

 use PHPUnit\Framework\TestCase;

 use function PHPUnit\Framework\assertNotNull;

 final class SomeTest extends TestCase
 {
-    #[\PHPUnit\Framework\Attributes\DoesNotPerformAssertions]
     public function testSomething(): void
     {
         assertNotNull(true);
     }
 }

AssertCallAnalyzer now also treats a FuncCall resolved to PHPUnit\Framework\assert* (and the other known assert prefixes) as an assertion, whether imported via use function or fully qualified.