Rename cxx_precompile to cxx_modules_precompile

Summary: Rename to reduce confusion with `cxx_precompiled_header` rule.

Reviewed By: nhatminhle

Differential Revision: D71430240

fbshipit-source-id: 9d6486545fdc4d9791721ab79269e8ac3d79999b

Author: Christy Lee-Eusman

prelude/cxx/compile.bzl

@@ -791,7 +791,7 @@ def _precompile_single_cxx(
 
     ctx.actions.run(
         cmd,
-        category = "cxx_precompile",
+        category = "cxx_modules_precompile",
         identifier = identifier,
         dep_files = action_dep_files,
         allow_cache_upload = src_compile_cmd.cxx_compile_cmd.allow_cache_upload,