Add Gradle test task to run Gradle and Kotlin daemon tests.

These tests could not run in parallel, as they could not share
Gradle or Kotlin daemons with other running in parallel tests.

^KT-45745 In Progress

libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle.kts

@@ -172,9 +172,23 @@ val simpleTestsTask = tasks.register<Test>("kgpSimpleTests") {
     }
 }
 
+// Daemon tests could run only sequentially as they could not be shared between parallel test builds
+val daemonsTestsTask = tasks.register<Test>("kgpDaemonTests") {
+    group = KGP_TEST_TASKS_GROUP
+    description = "Run only Gradle and Kotlin daemon tests for Kotlin Gradle Plugin"
+    maxParallelForks = 1
+
+    mustRunAfter(simpleTestsTask)
+
+    useJUnitPlatform {
+        includeTags("DaemonsKGP")
+        includeEngines("junit-jupiter")
+    }
+}
+
 tasks.named<Task>("check") {
     dependsOn("testAdvanceGradleVersion")
-    dependsOn(simpleTestsTask)
+    dependsOn(simpleTestsTask, daemonsTestsTask)
     if (isTeamcityBuild) {
         dependsOn("testAdvanceGradleVersionMppAndAndroid")
         dependsOn("testMppAndAndroid")
@@ -184,17 +198,6 @@ tasks.named<Task>("check") {
     }
 }
 
-val kgpJunit5Tests = tasks.register<Test>("kgpJunit5Tests") {
-    group = KGP_TEST_TASKS_GROUP
-    description = "Run only JUnit 5 tests for Kotlin Gradle Plugin"
-    maxParallelForks = (Runtime.getRuntime().availableProcessors() / 4).coerceAtLeast(1)
-
-    useJUnitPlatform {
-        includeTags("JUnit5")
-        includeEngines("junit-jupiter")
-    }
-}
-
 tasks.withType<KotlinCompile> {
     kotlinOptions.jdkHome = rootProject.extra["JDK_18"] as String
     kotlinOptions.jvmTarget = "1.8"
@@ -224,7 +227,7 @@ tasks.withType<Test> {
 
     val shouldApplyJunitPlatform = name !in setOf(
         simpleTestsTask.name,
-        kgpJunit5Tests.name
+        daemonsTestsTask.name
     )
     if (shouldApplyJunitPlatform) {
         maxHeapSize = "512m"

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/testbase/testTags.kt

@@ -14,3 +14,11 @@ import org.junit.jupiter.api.Tag
 @Retention(AnnotationRetention.RUNTIME)
 @Tag("SimpleKGP")
 annotation class SimpleGradlePluginTests
+
+/**
+ * Add it to test classes performing Gradle or Kotlin daemon checks.
+ */
+@Target(AnnotationTarget.CLASS, AnnotationTarget.ANNOTATION_CLASS)
+@Retention(AnnotationRetention.RUNTIME)
+@Tag("DaemonsKGP")
+annotation class DaemonsGradlePluginTests