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/componentUsage.kt

@@ -7,5 +7,5 @@ class Data {
 }
 
 fun use() {
-    val (<!DEPRECATED_SYMBOL_WITH_MESSAGE!>x<!>, y) = Data()
-}
+    val (<!DEPRECATION!>x<!>, y) = Data()
+}