Merge two deprecation diagnostics into one DEPRECATION

This also fixes weird suppressions in user code: instead of
«@Suppress("DEPRECATED_SYMBOL_WITH_MESSAGE")» you should now use
«@Suppress("DEPRECATION")»

compiler/testData/diagnostics/tests/deprecated/javaDocDeprecated.kt

@@ -15,6 +15,6 @@ public class A {
 
 // FILE: B.kt
 
-class B(private val foo: String) : <!DEPRECATED_SYMBOL_WITH_MESSAGE!>A<!>() {
-    override fun getFoo(text: String): String = super.<!DEPRECATED_SYMBOL_WITH_MESSAGE!>getFoo<!>(text + foo)
+class B(private val foo: String) : <!DEPRECATION!>A<!>() {
+    override fun getFoo(text: String): String = super.<!DEPRECATION!>getFoo<!>(text + foo)
 }