Revert "[co19] co19_2 tests roll (DEPS and .status files update)"

This reverts commit f99b9b8.

Reason for revert: Rolls in a version of co19_2 that contains two files whose name differs only by case and whose content is not the same.  This breaks "gclient sync" on machines with case-insensitive filesystems (e.g. macs).

Original change's description:
> [co19] co19_2 tests roll (DEPS and .status files update)
> 
> Closes #33894
> 
> Cq-Include-Trybots: luci.dart.try:front-end-mac-release-x64;luci.dart.try:front-end-win-release-x6;luci.dart.try:analyzer-mac-release;luci.dart.try:analyzer-win-release
> Change-Id: If1fd4c78cb1c7948602d9a26276cce75cf3133d4
> Reviewed-on: https://dart-review.googlesource.com/68860
> Commit-Queue: Alexander Thomas <[email protected]>
> Reviewed-by: Alexander Thomas <[email protected]>

[email protected],[email protected],[email protected],[email protected]

Change-Id: Icd6d8d763c8baff2b82bd15c6b28c56591b7431e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: luci.dart.try:front-end-mac-release-x64;luci.dart.try:front-end-win-release-x6;luci.dart.try:analyzer-mac-release;luci.dart.try:analyzer-win-release
Reviewed-on: https://dart-review.googlesource.com/69340
Commit-Queue: Paul Berry <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

Author: stereotype441

DEPS

@@ -37,7 +37,7 @@ vars = {
   "fuchsia_git": "https://fuchsia.googlesource.com",
 
   "co19_rev": "9858ee7d79cf09b50d6b5bc13fb950ae5f357954",
-  "co19_2_rev": "773b76e002f56d69535f14316c2b93d5ff591627",
+  "co19_2_rev": "bafb589613379dc1f2e3511566661a5c6250486a",
 
   # As Flutter does, we pull buildtools, including the clang toolchain, from
   # Fuchsia. This revision should be kept up to date with the revision pulled