Update Gradle module metadata warnings: don't warn when it's enabled

Also add a suggestion to enable the module metadata publishing in
Gradle 5.3+ projects that consume Gradle module metadata by default but
don't produce it unless explicitly enabled.

Issue #KT-31023 Fixed

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

@@ -4,6 +4,7 @@
  */
 package org.jetbrains.kotlin.gradle
 
+import org.jetbrains.kotlin.gradle.internals.GRADLE_NO_METADATA_WARNING
 import org.jetbrains.kotlin.gradle.plugin.ProjectLocalConfigurations
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinJvmWithJavaTargetPreset
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinMultiplatformPlugin
@@ -1834,4 +1835,20 @@ class NewMultiplatformIT : BaseGradleIT() {
         doTestPomRewriting(mppProjectDependency = false, legacyPublishing = false, keepPomIntact = true)
         doTestPomRewriting(mppProjectDependency = false, legacyPublishing = true, keepPomIntact = true)
     }
+
+    @Test
+    fun testSuggestionToEnableMetadata() = with(Project("sample-lib", GradleVersionRequired.AtLeast("4.7"), "new-mpp-lib-and-app")) {
+        build {
+            assertNotContains(GRADLE_NO_METADATA_WARNING)
+
+            gradleSettingsScript().modify { it.replace("enableFeaturePreview(", "//") }
+            build {
+                if (testGradleVersionAtLeast("5.3-rc-2")) {
+                    assertContains(GRADLE_NO_METADATA_WARNING)
+                } else {
+                    assertNotContains(GRADLE_NO_METADATA_WARNING)
+                }
+            }
+        }
+    }
 }