jvm-abi-gen: Remove internal declarations from ABI

#KT-65690 Fixed

plugins/jvm-abi-gen/testData/compare/internalFields/base/test.kt

@@ -0,0 +1,14 @@
+package test
+
+@JvmField
+internal val a: String = ""
+
+internal val b: String = ""
+
+fun emptyKtClassWorkaround() = Unit
+class Class {
+    @JvmField
+    internal val a: String = ""
+
+    internal val b: String = ""
+}

plugins/jvm-abi-gen/testData/compare/internalFields/directives.txt

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

plugins/jvm-abi-gen/testData/compare/internalFields/sameAbi/test.kt

@@ -0,0 +1,4 @@
+package test
+
+fun emptyKtClassWorkaround() = Unit
+class Class