Deduplicate bug-11430 test data files for Methods and nsrt

Use a single test data file in nsrt/ for both the ReturnTypeRule test
and the NodeScopeResolver assertType test, instead of maintaining two
nearly identical copies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

tests/PHPStan/Analyser/nsrt/bug-11430.php

@@ -1,6 +1,6 @@
 <?php declare(strict_types = 1);
 
-namespace Bug11430Nsrt;
+namespace Bug11430Methods;
 
 use function PHPStan\Testing\assertType;
 
@@ -95,4 +95,4 @@ class Test
 /** @var ?string $foo */
 $foo = null;
 $test->name = Option::fromValue($foo);
-assertType('Bug11430Nsrt\Option<string>', $test->name);
+assertType('Bug11430Methods\Option<string>', $test->name);

tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php

@@ -1328,7 +1328,7 @@ public function testBug10924(): void
 
 	public function testBug11430(): void
 	{
-		$this->analyse([__DIR__ . '/data/bug-11430.php'], []);
+		$this->analyse([__DIR__ . '/../../Analyser/nsrt/bug-11430.php'], []);
 	}
 
 }