[Gradle] Fix task created by KotlinJvmApi is not configuration cache compatible

In this case, "kotlin" extension is missing on the project, which leads
to inaccessible "compilerVersion" property. Now logic fallbacks to
the current plugin version.

^KT-67685 Verification Pending

Author: Tapchicoma

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

@@ -15,6 +15,10 @@ import kotlin.io.path.writeText
 
 @DisplayName("JVM API validation")
 class KotlinJvmApiTest : KGPBaseTest() {
+    override val defaultBuildOptions: BuildOptions = super.defaultBuildOptions.copy(
+        configurationCache = true
+    )
+
     @DisplayName("Kotlin compilation can be set up using APIs")
     @JvmGradlePluginTests
     @GradleTest

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPluginWrapper.kt

@@ -113,7 +113,7 @@ abstract class DefaultKotlinBasePlugin : KotlinBasePlugin {
                         .withType<ExternalDependency>()
                         .configureEach { dependency ->
                             dependency.version { versionConstraint ->
-                                versionConstraint.strictly(project.kotlinExtension.compilerVersion.get())
+                                versionConstraint.strictly(project.kotlinExtensionOrNull?.compilerVersion?.get() ?: pluginVersion)
                             }
                         }
                 }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/unitTests/KotlinCompileApiTest.kt

@@ -7,8 +7,10 @@ package org.jetbrains.kotlin.gradle.unitTests
 
 import org.gradle.api.internal.project.ProjectInternal
 import org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode
+import org.jetbrains.kotlin.gradle.internal.KOTLIN_COMPILER_EMBEDDABLE
+import org.jetbrains.kotlin.gradle.internal.KOTLIN_MODULE_GROUP
+import org.jetbrains.kotlin.gradle.plugin.COMPILER_CLASSPATH_CONFIGURATION_NAME
 import org.jetbrains.kotlin.gradle.plugin.KotlinApiPlugin
-import org.jetbrains.kotlin.gradle.plugin.KotlinJvmFactory
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import org.jetbrains.kotlin.gradle.tasks.KotlinJvmCompile
 import org.jetbrains.kotlin.gradle.util.buildProject
@@ -17,15 +19,14 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.rules.TemporaryFolder
 import kotlin.test.assertEquals
-import kotlin.test.assertTrue
 
 class KotlinCompileApiTest {
 
     @get:Rule
     val tmpDir = TemporaryFolder()
 
     private lateinit var project: ProjectInternal
-    private lateinit var plugin: KotlinJvmFactory
+    private lateinit var plugin: KotlinApiPlugin
     private lateinit var taskApi: KotlinJvmCompile
     private lateinit var taskImpl: KotlinCompile
 
@@ -143,4 +144,18 @@ class KotlinCompileApiTest {
         project.evaluate()
         assertEquals(ExplicitApiMode.Strict, taskImpl.explicitApiMode.orNull)
     }
+
+    @Test
+    fun testBuiltToolsApiVersion() {
+        val compilerDependency = project.configurations
+            .getByName(COMPILER_CLASSPATH_CONFIGURATION_NAME)
+            .incoming
+            .dependencies
+            .single()
+
+        assertEquals(
+            "$KOTLIN_MODULE_GROUP:$KOTLIN_COMPILER_EMBEDDABLE:${plugin.pluginVersion}",
+            "${compilerDependency.group}:${compilerDependency.name}:${compilerDependency.version}"
+        )
+    }
 }