Revert "Ignore PHPStan errors in test cases for errors" as these errors are not reported on PHPStan Rule Level 4

This reverts commit 60fe3d7.

Author: sebastianbergmann

tests/tests/Target/MapperTest.php

@@ -122,7 +122,6 @@ public static function invalidProvider(): array
                 'Class DoesNotExist is not a valid target for code coverage',
                 TargetCollection::fromArray(
                     [
-                        /** @phpstan-ignore argument.type */
                         Target::forClass('DoesNotExist'),
                     ],
                 ),
@@ -131,7 +130,6 @@ public static function invalidProvider(): array
                 'Classes that extend class DoesNotExist is not a valid target for code coverage',
                 TargetCollection::fromArray(
                     [
-                        /** @phpstan-ignore argument.type */
                         Target::forClassesThatExtendClass('DoesNotExist'),
                     ],
                 ),
@@ -140,7 +138,6 @@ public static function invalidProvider(): array
                 'Classes that implement interface DoesNotExist is not a valid target for code coverage',
                 TargetCollection::fromArray(
                     [
-                        /** @phpstan-ignore argument.type */
                         Target::forClassesThatImplementInterface('DoesNotExist'),
                     ],
                 ),
@@ -157,7 +154,6 @@ public static function invalidProvider(): array
                 'Method DoesNotExist::doesNotExist is not a valid target for code coverage',
                 TargetCollection::fromArray(
                     [
-                        /** @phpstan-ignore argument.type */
                         Target::forMethod('DoesNotExist', 'doesNotExist'),
                     ],
                 ),