Remove unused always true check

This does not work, and is not worth fixing as the setup kernel time amounts to 0.002ms per run, which is 2ms for the entire unit test suite of just over 1000 tests, and only a subset of those even use this.

packages/testing/src/UnitTestCase.php

@@ -13,17 +13,13 @@
 
 abstract class UnitTestCase extends BaseTestCase
 {
-    protected static bool $hasSetUpKernel = false;
-
     protected static bool $needsKernel = false;
     protected static bool $needsConfig = false;
     protected static bool $needsRender = false;
 
     protected static function needsKernel(): void
     {
-        if (! self::$hasSetUpKernel) {
-            self::setupKernel();
-        }
+        self::setupKernel();
     }
 
     public static function setUpBeforeClass(): void
@@ -44,7 +40,6 @@ public static function setUpBeforeClass(): void
     protected static function setupKernel(): void
     {
         HydeKernel::setInstance(new HydeKernel());
-        self::$hasSetUpKernel = true;
     }
 
     protected static function resetKernel(): void