[TASK] Speed up a functional test using snapshot

Using functional test related .yaml scenario setup
which uses DataHandler to prime the test database
is pretty slow.
TreeControllerTest can speed up using the
withDatabaseSnapshot() method to cache db results
for subsequent tests.

Resolves: #97934
Releases: main
Change-Id: I4c8f40f181f77bf07a0b26825138cb1577fe441e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75173
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/backend/Tests/Functional/Controller/Page/TreeControllerTest.php

@@ -59,7 +59,14 @@ protected function setUp(): void
         //admin user for importing dataset
         $this->backendUser = $this->setUpBackendUser(1);
 
-        $this->setUpDatabase();
+        $this->withDatabaseSnapshot(function () {
+            Bootstrap::initializeLanguageObject();
+            $scenarioFile = __DIR__ . '/Fixtures/PagesWithBEPermissions.yaml';
+            $factory = DataHandlerFactory::fromYamlFile($scenarioFile);
+            $writer = DataHandlerWriter::withBackendUser($this->backendUser);
+            $writer->invokeFactory($factory);
+            static::failIfArrayIsNotEmpty($writer->getErrors());
+        });
 
         //regular editor, non admin
         $this->backendUser = $this->setUpBackendUser(9);
@@ -73,18 +80,6 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
-    protected function setUpDatabase(): void
-    {
-        Bootstrap::initializeLanguageObject();
-        $scenarioFile = __DIR__ . '/Fixtures/PagesWithBEPermissions.yaml';
-        $factory = DataHandlerFactory::fromYamlFile($scenarioFile);
-        $writer = DataHandlerWriter::withBackendUser($this->backendUser);
-        $writer->invokeFactory($factory);
-        static::failIfArrayIsNotEmpty(
-            $writer->getErrors()
-        );
-    }
-
     /**
      * @test
      */