kotlin-test-wasm: correct main source sets compilation, KT-61342

- Do not include test sources in main source sets
- Extract commonWasm source set that contains code shared between
wasm-js and wasm-wasi

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

@@ -7,7 +7,7 @@ plugins {
 configureWasmKotlinTest(
     wasmTargetParameter = "wasm-js",
     wasmTargetAttribute = KotlinWasmTargetAttribute.js,
-    targetSourceDir = "$rootDir/libraries/kotlin.test/wasm/js/src",
+    targetSourceDir = "$rootDir/libraries/kotlin.test/wasm/js/src/main/kotlin",
     stdDependencyName = ":kotlin-stdlib-wasm-js"
 ) { extensionBody ->
     kotlin(extensionBody)

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

@@ -7,7 +7,7 @@ plugins {
 configureWasmKotlinTest(
     wasmTargetParameter = "wasm-wasi",
     wasmTargetAttribute = KotlinWasmTargetAttribute.wasi,
-    targetSourceDir = "$rootDir/libraries/kotlin.test/wasm/wasi/src",
+    targetSourceDir = "$rootDir/libraries/kotlin.test/wasm/wasi/src/main/kotlin",
     stdDependencyName = ":kotlin-stdlib-wasm-wasi"
 ) { extensionBody ->
     kotlin(extensionBody)