Fix Error in snippet at /mnt/agent/work/b8625f0804e53334/tutorials/./UI_Testing/README.md:9 (#3628)

Crashes, because tutorial checker uses desktop-template without uiTesting module

See https://teamcity.jetbrains.com/buildConfiguration/JetBrainsPublicProjects_Compose_Publish_2_AllGitHubRelease/4301157?hideProblemsFromDependencies=false&hideTestsFromDependencies=false&expandBuildProblemsSection=true&expandBuildChangesSection=true

Also adding "``` kotlin` hach to avoid compilation of some snippets 9we use it in another places)

ci/templates/desktop-template/build.gradle.kts

@@ -17,6 +17,9 @@ dependencies {
     // (in a separate module for demo project and in testMain).
     // With compose.desktop.common you will also lose @Preview functionality
     implementation(compose.desktop.currentOs)
+
+    // Include the Test API
+    implementation(compose.desktop.uiTestJUnit4)
 }
 
 compose.desktop {

ci/templates/desktop-template/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists