[Build] Fix a bunch of buildscript compilation warnings

#KTI-1221 Fixed

libraries/kotlin.test/js-ir/build.gradle.kts

@@ -28,16 +28,16 @@ kotlin {
     }
 
     sourceSets {
-        val commonMain by getting {
+        named("commonMain") {
             dependencies {
                 api(project(":kotlin-stdlib-js-ir"))
             }
             kotlin.srcDir(commonMainSources.get().destinationDir)
         }
-        val commonTest by getting {
+        named("commonTest") {
             kotlin.srcDir(commonTestSources.get().destinationDir)
         }
-        val jsMain by getting {
+        named("jsMain") {
             dependencies {
                 api(project(":kotlin-stdlib-js-ir"))
             }

libraries/kotlin.test/js-ir/it/build.gradle.kts

@@ -38,7 +38,7 @@ kotlin {
     }
 
     sourceSets {
-        val test by getting {
+        named("test") {
             kotlin.srcDir(jsMainSources.get().destinationDir)
         }
     }
@@ -78,7 +78,7 @@ fun createFrameworkTest(name: String): TaskProvider<NpmTask> {
     return tasks.register("test$name", NpmTask::class.java) {
         dependsOn(compileTestDevelopmentExecutableKotlinJs, populateNodeModules, "npmInstall")
         val testName = name
-        val lowerName = name.toLowerCase()
+        val lowerName = name.lowercase()
         val tcOutput = project.file("$buildDir/tc-${lowerName}.log")
         val stdOutput = "$buildDir/test-${lowerName}.log"
         val errOutput = "$buildDir/test-${lowerName}.err.log"

libraries/kotlin.test/wasm/build.gradle.kts

@@ -13,20 +13,20 @@ val commonMainSources by task<Sync> {
 }
 
 kotlin {
+    @OptIn(org.jetbrains.kotlin.gradle.targets.js.dsl.ExperimentalWasmDsl::class)
     wasm {
         nodejs()
     }
 
-    @Suppress("UNUSED_VARIABLE")
     sourceSets {
-         val commonMain by getting {
+         named("commonMain") {
             dependencies {
                 api(project(":kotlin-stdlib-wasm"))
             }
             kotlin.srcDir(commonMainSources.get().destinationDir)
         }
 
-        val wasmMain by getting {
+        named("wasmMain") {
             dependencies {
                 api(project(":kotlin-stdlib-wasm"))
             }