Do not build release variant for Android Gradle test

This speeds up the test case significally. On my machine the time spent
in test case dropped from 1+ minute to 15 seconds.

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

@@ -131,7 +131,7 @@ abstract class AbstractKotlinAndroidGradleTests(
 
         val modules = listOf("Android", "Lib")
         val flavors = listOf("Flavor1", "Flavor2")
-        val buildTypes = listOf("Debug", "Release")
+        val buildTypes = listOf("Debug")
 
         val tasks = arrayListOf<String>()
         for (module in modules) {
@@ -142,31 +142,26 @@ abstract class AbstractKotlinAndroidGradleTests(
             }
         }
 
-        project.build("build", "assembleAndroidTest") {
+        project.build("assembleDebug", "test") {
             assertSuccessful()
             // Before 3.0 AGP test only modules are compiled only against one flavor and one build type,
             // and contain only the compileDebugKotlin task.
             // After 3.0 AGP test only modules contain a compile<Variant>Kotlin task for each variant.
             tasks.addAll(findTasksByPattern(":Test:compile[\\w\\d]+Kotlin"))
             assertTasksExecuted(tasks)
-            if (isLegacyAndroidGradleVersion(androidGradlePluginVersion)) {
-                // known bug: new AGP does not run Kotlin tests
-                // https://issuetracker.google.com/issues/38454212
-                // TODO: remove when the bug is fixed
-                assertContains("InternalDummyTest PASSED")
-            }
+            assertContains("InternalDummyTest PASSED")
             checkKotlinGradleBuildServices()
         }
 
         // Run the build second time, assert everything is up-to-date
-        project.build("build") {
+        project.build("assembleDebug") {
             assertSuccessful()
             assertTasksUpToDate(tasks)
         }
 
         // Run the build third time, re-run tasks
 
-        project.build("build", "--rerun-tasks") {
+        project.build("assembleDebug", "--rerun-tasks") {
             assertSuccessful()
             assertTasksExecuted(tasks)
             checkKotlinGradleBuildServices()