jvm-abi-gen: Remove internal declarations from ABI

#KT-65690 Fixed

plugins/jvm-abi-gen/testData/content/internalClassAndCopyMethod/directives.txt

@@ -0,0 +1 @@
+// TREAT_INTERNAL_AS_PRIVATE

plugins/jvm-abi-gen/testData/content/internalClassAndCopyMethod/signatures.txt

@@ -0,0 +1,16 @@
+@kotlin.Metadata
+public final class test/Test$ConstructorToBeRemoved {
+    // source: 'test.kt'
+    public final inner class test/Test$ConstructorToBeRemoved
+    public final @org.jetbrains.annotations.NotNull method copy(@org.jetbrains.annotations.NotNull p0: java.lang.Object): test.Test$ConstructorToBeRemoved
+    public synthetic static method copy$default(p0: test.Test$ConstructorToBeRemoved, p1: java.lang.Object, p2: int, p3: java.lang.Object): test.Test$ConstructorToBeRemoved
+    public method equals(@org.jetbrains.annotations.Nullable p0: java.lang.Object): boolean
+    public method hashCode(): int
+    public @org.jetbrains.annotations.NotNull method toString(): java.lang.String
+}
+@kotlin.Metadata
+public final class test/Test {
+    // source: 'test.kt'
+    public final inner class test/Test$ConstructorToBeRemoved
+    public method <init>(): void
+}

plugins/jvm-abi-gen/testData/content/internalClassAndCopyMethod/test.kt

@@ -0,0 +1,5 @@
+package test
+
+class Test {
+    internal data class ConstructorToBeRemoved internal constructor(internal val fieldToBeRemoved: Any)
+}