[FIR] Create fake hidden versions of List.getFirst/getLast in JDK < 21

... so that overrides are marked as deprecated regardless of the JDK.

#KT-65440 Fixed

compiler/testData/diagnostics/tests/testsWithJava17/newListMethods.fir.kt

@@ -0,0 +1,29 @@
+import java.util.LinkedList
+
+class A<T> : ArrayList<T>() {
+    fun getFirst(): T = super.<!UNRESOLVED_REFERENCE!>getFirst<!>()
+    fun getLast(): T = super.<!UNRESOLVED_REFERENCE!>getLast<!>()
+}
+
+fun foo(x: List<String>, y: LinkedList<String>, z: A<String>) {
+    x.<!UNRESOLVED_REFERENCE!>getFirst<!>()
+    x.<!FUNCTION_CALL_EXPECTED!>first<!>
+    x.first() // stdlib extension on List
+    x.<!UNRESOLVED_REFERENCE!>getLast<!>()
+    x.<!FUNCTION_CALL_EXPECTED!>last<!>
+    x.last()
+
+    y.<!DEPRECATION!>getFirst<!>()
+    y.<!DEPRECATION!>first<!>
+    y.first()
+    y.<!DEPRECATION!>getLast<!>()
+    y.<!DEPRECATION!>last<!>
+    y.last()
+
+    z.<!DEPRECATION!>getFirst<!>()
+    z.<!FUNCTION_CALL_EXPECTED!>first<!>
+    z.first()
+    z.<!DEPRECATION!>getLast<!>()
+    z.<!FUNCTION_CALL_EXPECTED!>last<!>
+    z.last()
+}

compiler/testData/diagnostics/tests/testsWithJava17/newListMethods.kt

@@ -0,0 +1,29 @@
+import java.util.LinkedList
+
+class A<T> : ArrayList<T>() {
+    fun getFirst(): T = super.<!UNRESOLVED_REFERENCE!>getFirst<!>()
+    fun getLast(): T = super.<!UNRESOLVED_REFERENCE!>getLast<!>()
+}
+
+fun foo(x: List<String>, y: LinkedList<String>, z: A<String>) {
+    x.<!UNRESOLVED_REFERENCE!>getFirst<!>()
+    x.<!FUNCTION_CALL_EXPECTED!>first<!>
+    x.first() // stdlib extension on List
+    x.<!UNRESOLVED_REFERENCE!>getLast<!>()
+    x.<!FUNCTION_CALL_EXPECTED!>last<!>
+    x.last()
+
+    y.getFirst()
+    y.first
+    y.first()
+    y.getLast()
+    y.last
+    y.last()
+
+    z.getFirst()
+    z.<!FUNCTION_CALL_EXPECTED!>first<!>
+    z.first()
+    z.getLast()
+    z.<!FUNCTION_CALL_EXPECTED!>last<!>
+    z.last()
+}