[Serialization] Reorganize module structure

generators/protobuf/GenerateProtoBuf.kt

@@ -53,7 +53,7 @@ val PROTO_PATHS: List<ProtoPath> = listOf(
     ProtoPath("compiler/util-klib-metadata/src/KlibMetadataProtoBuf.proto"),
     ProtoPath("compiler/ir/serialization.common/src/KotlinIr.proto", false),
     ProtoPath("compiler/ir/serialization.jvm/src/JvmIr.proto", false),
-    ProtoPath("plugins/kotlin-serialization/kotlin-serialization-compiler/src/class_extensions.proto", generateDebug = false)
+    ProtoPath("plugins/kotlinx-serialization/kotlinx-serialization.k1/src/class_extensions.proto", generateDebug = false)
 )
 
 private val EXT_OPTIONS_PROTO_PATH = ProtoPath("core/metadata/src/ext_options.proto")

generators/tests/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -207,23 +207,6 @@ fun main(args: Array<String>) {
             }
         }
 
-        testGroup(
-            "plugins/kotlin-serialization/kotlin-serialization-compiler/test",
-            "plugins/kotlin-serialization/kotlin-serialization-compiler/testData"
-        ) {
-            testClass<AbstractSerializationPluginDiagnosticTest> {
-                model("diagnostics")
-            }
-
-            testClass<AbstractSerializationPluginBytecodeListingTest> {
-                model("codegen")
-            }
-
-            testClass<AbstractSerializationIrBytecodeListingTest> {
-                model("codegen")
-            }
-        }
-
         testGroup("plugins/fir-plugin-prototype/fir-plugin-ic-test/tests-gen", "plugins/fir-plugin-prototype/fir-plugin-ic-test/testData") {
             testClass<AbstractIncrementalFirJvmWithPluginCompilerRunnerTest> {
                 model("pureKotlin", extension = null, recursive = false, targetBackend = TargetBackend.JVM_IR)