Issue #3358890 by Spokje, mondrake, smustgrave: Fix PHPStan L1 errors "Class \Foo\Bar not found."

core/phpstan-baseline.neon

@@ -2880,16 +2880,6 @@ parameters:
 			count: 1
 			path: tests/Drupal/Tests/Composer/ComposerTest.php
 
-		-
-			message: "#^Class Drupal\\\\Driver\\\\Database\\\\corefake\\\\Install\\\\Tasks not found\\.$#"
-			count: 1
-			path: tests/Drupal/Tests/Core/Database/InstallerObjectTest.php
-
-		-
-			message: "#^Class Drupal\\\\Driver\\\\Database\\\\fake\\\\Install\\\\Tasks not found\\.$#"
-			count: 1
-			path: tests/Drupal/Tests/Core/Database/InstallerObjectTest.php
-
 		-
 			message: "#^Trying to mock an undefined method getRevisionId\\(\\) on class Drupal\\\\Tests\\\\Core\\\\Entity\\\\UrlTestEntity\\.$#"
 			count: 1

core/tests/Drupal/Tests/Core/Database/InstallerObjectTest.php

@@ -63,9 +63,11 @@ public function providerDbInstallerObject() {
       ['mysql', "Drupal\\mysql\\Driver\\Database\\mysql", MysqlInstallTasks::class],
 
       // A driver only in the custom namespace.
+      // @phpstan-ignore-next-line
       ['fake', "Drupal\\Driver\\Database\\fake", FakeInstallTasks::class],
 
       // A driver in both namespaces. The custom one takes precedence.
+      // @phpstan-ignore-next-line
       ['corefake', "Drupal\\Driver\\Database\\corefake", CustomCoreFakeInstallTasks::class],
 
       // A driver from a module that has a different name as the driver.