fix(copybara): don't hide internal code in .copybara

This resulted in the copybara transformation being hidden in
.copybara/copy.bara.sky in the external repo.

GitOrigin-RevId: 4e57b4832e3e491ad02132c787e596af7ee6f593
diff --git a/.copybara/copy.bara.sky b/.copybara/copy.bara.sky
index e6c9499..1b049de 100644
--- a/.copybara/copy.bara.sky
+++ b/.copybara/copy.bara.sky
@@ -8,6 +8,11 @@
     origin_url = test_origin_url
     destination_url = test_destination_url
 
+  allPathsExceptCopybara = glob(
+    ["**"],
+    exclude = [".copybara/**"],
+  )
+
   core.workflow(
     name = name,
     description = description,
@@ -49,17 +54,16 @@
       core.replace(
         before="private/dotfiles",
         after="dotfiles-external",
-        paths = glob(
-          ["**"],
-          exclude = [".copybara/**"],
-        ),
+        paths = allPathsExceptCopybara,
       ),
       core.replace(
         before = "${internalCode}",
         after = "",
         multiline = True,
         regex_groups = {
+          "internalCode": "(?m)^.*BEGIN-INTERNAL[\\w\\W]*?END-INTERNAL.*$\\n",
         },
+        paths = allPathsExceptCopybara,
       ),
       metadata.remove_label('Change-Id'),
     ],