[Commonizer] Logging: Remove 'COMMONIZATION' prologue

^KT-36679

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

@@ -16,27 +16,31 @@ import kotlin.test.fail
 class CommonizerIT : BaseGradleIT() {
     override val defaultGradleVersion: GradleVersionRequired = GradleVersionRequired.FOR_MPP_SUPPORT
 
+    companion object {
+        private const val commonizerOutput = "Preparing commonized Kotlin/Native libraries"
+    }
+
     @Test
     fun `test commonizeNativeDistributionWithIosLinuxWindows`() {
         with(Project("commonizeNativeDistributionWithIosLinuxWindows")) {
             build(":p1:commonize", "-Pkotlin.mpp.enableNativeDistributionCommonizationCache=false") {
                 assertTasksExecuted(":p1:commonizeNativeDistribution")
                 assertContains(DISABLED_NATIVE_TARGETS_REPORTER_WARNING_PREFIX)
-                assertContains("Kotlin KLIB commonizer:")
+                assertContains(commonizerOutput)
                 assertSuccessful()
             }
 
             build(":p1:commonize", "--rerun-tasks", "-Pkotlin.mpp.enableNativeDistributionCommonizationCache=true") {
                 assertTasksExecuted(":p1:commonizeNativeDistribution")
                 assertContains("Native Distribution Commonization: Cache hit")
-                assertNotContains("Kotlin KLIB commonizer:")
+                assertNotContains(commonizerOutput)
                 assertSuccessful()
             }
 
             build(":p1:commonize", "--rerun-tasks", "-Pkotlin.mpp.enableNativeDistributionCommonizationCache=false") {
                 assertTasksExecuted(":p1:commonizeNativeDistribution")
                 assertContains("Native Distribution Commonization: Cache disabled")
-                assertContains("Kotlin KLIB commonizer:")
+                assertContains(commonizerOutput)
                 assertSuccessful()
             }
         }

native/commonizer/src/org/jetbrains/kotlin/commonizer/cli/Task.kt

@@ -16,7 +16,7 @@ internal abstract class Task(private val options: Collection<Option<*>>) : Compa
         // Important: the order of entries affects that order of tasks execution
         INFORMATIONAL,
         COMMONIZATION(
-            prologue = "\nKotlin KLIB commonizer: Please wait while preparing libraries.",
+            prologue = null,
             epilogue = "\n",
             logEachStep = true
         )