Remove depreated APIs and WGSL

WGSL:
* Remove vertex_idx and instance_idx.
  These are now vertex_index and instance_index.
  It seems this was removed once before, then reverted due to CTS
  failures, but the original change never landed again.
* Remove the [[set(n)]] decoration. This has been [[group(n)]] for
  months now.

API:
* Remove deprecated enums from transform::VertexFormat.
* Remove transform::Renamer constructor that takes a Config. This should
  be passed by DataMap.
* Remove ast::AccessControl alias to ast::Access.

Change-Id: I988c96c4269b02a5d77163409f261fd5923188e0
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/56541
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>

src/ast/access.h

@@ -38,9 +38,6 @@ enum Access {
 /// @return the std::ostream so calls can be chained
 std::ostream& operator<<(std::ostream& out, Access access);
 
-/// [DEPRECATED]: Old name in use by Dawn.
-using AccessControl = Access;
-
 }  // namespace ast
 }  // namespace tint