Remove cpp2.declare_bitwise_ops

Summary:
Replace the only two uses of `cpp2.declare_bitwise_ops` with `cpp.declare_bitwise_ops` and remove it, simplifying the compiler logic. Codemod will take care of `cpp.declare_bitwise_ops`.

Report an error if `cpp2.declare_bitwise_ops` is used.

Reviewed By: iahs

Differential Revision: D71324803

fbshipit-source-id: ca523736ab15a03ed929160c2db1c4fd07a073b6

Author: vitaut

exactprint/tests/fbthrift-tests/mcpp2-compare/src/module.thrift

@@ -66,7 +66,7 @@ enum AnnotatedEnum {
   FIELDA = 2,
   FIELDB = 4,
   FIELDC = 9,
-} (cpp2.declare_bitwise_ops)
+} (cpp.declare_bitwise_ops)
 
 @cpp.EnumType{type = cpp.EnumUnderlyingType.I16}
 enum AnnotatedEnum2 {