KT-58862: Remove cinterop -mode option

metadata cinterop libraries perform pretty well for years,
so we can drop this flag.

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

@@ -173,20 +173,6 @@ class NativeDownloadAndPlatformLibsIT : BaseGradleIT() {
         }
     }
 
-    @Test
-    fun testSettingGenerationMode() = with(platformLibrariesProject("linuxX64")) {
-        // Check that user can change generation mode used by the cinterop tool.
-        buildWithLightDist("tasks", "-Pkotlin.native.platform.libraries.mode=metadata") {
-            assertSuccessful()
-            assertTrue(
-                extractNativeCompilerCommandLineArguments(
-                    taskOutput = output,
-                    toolName = NativeToolKind.GENERATE_PLATFORM_LIBRARIES
-                ).containsSequentially("-mode", "metadata")
-            )
-        }
-    }
-
     @Test
     fun testCompilerReinstallation() = with(platformLibrariesProject("linuxX64")) {
         // Install the compiler at the first time. Don't build to reduce execution time.

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

@@ -73,7 +73,6 @@ data class BuildOptions(
         val cocoapodsArchs: String? = null,
         val distributionType: String? = null,
         val distributionDownloadFromMaven: Boolean? = null,
-        val platformLibrariesMode: String? = null,
         val reinstall: Boolean? = null,
         val restrictedDistribution: Boolean? = null,
         val useXcodeMessageStyle: Boolean? = null,
@@ -219,9 +218,6 @@ data class BuildOptions(
         nativeOptions.distributionType?.let {
             arguments.add("-Pkotlin.native.distribution.type=${it}")
         }
-        nativeOptions.platformLibrariesMode?.let {
-            arguments.add("-Pkotlin.native.platform.libraries.mode=${it}")
-        }
         nativeOptions.reinstall?.let {
             arguments.add("-Pkotlin.native.reinstall=${it}")
         }

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

@@ -303,13 +303,6 @@ internal class PropertiesProvider private constructor(private val project: Proje
     val nativeDownloadFromMaven: Boolean
         get() = this.booleanProperty("kotlin.native.distribution.downloadFromMaven") ?: false
 
-    /**
-     * Allows a user to force a particular cinterop mode for platform libraries generation. Available modes: sourcecode, metadata.
-     * A main purpose of this property is working around potential problems with the metadata mode.
-     */
-    val nativePlatformLibrariesMode: String?
-        get() = this.property("kotlin.native.platform.libraries.mode")
-
     /**
      * Allows a user to provide a local Kotlin/Native distribution instead of a downloaded one.
      */

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/PlatformLibrariesGenerator.kt

@@ -46,10 +46,6 @@ internal class PlatformLibrariesGenerator(val project: Project, val konanTarget:
     private val shouldBuildCaches: Boolean =
         konanPropertiesService.cacheWorksFor(konanTarget) && konanCacheKind != NativeCacheKind.NONE
 
-    private val mode: String? by lazy {
-        PropertiesProvider(project).nativePlatformLibrariesMode
-    }
-
     private val presentDefs: Set<String> by lazy {
         defDirectory
             .listFiles { file -> file.extension == "def" }.orEmpty()
@@ -126,11 +122,6 @@ internal class PlatformLibrariesGenerator(val project: Project, val konanTarget:
                 args.addArg("-cache-arg", it)
             }
         }
-
-        mode?.let {
-            args.addArg("-mode", it)
-        }
-
         KotlinNativeLibraryGenerationRunner.fromProject(this).run(args)
     }