[MPP] Don't report HMPP deprecation warnings on subprojects

MPP plugin applied to a root project leads to false positive reports
in its subprojects. Also, granular metadata flag is not supposed to be
set in subprojects. Reporting only for the root project should cover
most of the cases.

KT-55891

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/mppDeprecatedProperties/settings.gradle.kts

@@ -0,0 +1 @@
+include(":subproject")

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/mppDeprecatedProperties/subproject/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+kotlin {
+    jvm()
+}

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/internal/deprecationDiagnostics.kt

@@ -38,6 +38,8 @@ internal fun checkAndReportDeprecatedNativeTargets(project: Project) {
  * Warnings have to be reported only for successfully evaluated projects without errors.
  */
 internal fun checkAndReportDeprecatedMppProperties(project: Project) {
+    if (project !== project.rootProject) return
+
     val projectProperties = project.kotlinPropertiesProvider
     if (projectProperties.ignoreHmppDeprecationWarnings == true) return