fix: Make sure Assert::assertIsList correctly asserts an array as list

Author: mitelg

Diff for: extension.neon

@@ -9,6 +9,7 @@ parameters:
 			- markTestIncomplete
 			- markTestSkipped
 	stubFiles:
+		- stubs/Assert.stub
 		- stubs/InvocationMocker.stub
 		- stubs/MockBuilder.stub
 		- stubs/MockObject.stub

Diff for: stubs/Assert.stub

@@ -0,0 +1,13 @@
+<?php
+
+namespace PHPUnit\Framework;
+
+abstract class Assert
+{
+    /**
+     * @phpstan-assert list $array
+     *
+     * @throws ExpectationFailedException
+     */
+    final public static function assertIsList(mixed $array, string $message = '') {}
+}

Diff for: stubs/ExpectationFailedException.stub

@@ -0,0 +1,8 @@
+<?php
+
+namespace PHPUnit\Framework;
+
+final class ExpectationFailedException
+{
+
+}