Update OWNERS for new reclient_metrics* files

Change crrev.com/c/4764130 added reclient_metrics.bat and
reclient_metrics but didn't add an entry to OWNERS to match the existing
reclient_metrics.py entries. This adds reclient_metrics* entries, thus
capturing the two new files as well as reclient_metrics.README.md.

Bug: None
Change-Id: I0820f9f87d0c6fb5bb2bd5232e929da81257d669
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4794713
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Junji Watanabe <jwata@google.com>
Commit-Queue: Junji Watanabe <jwata@google.com>
Reviewed-by: Scott Lee <ddoman@chromium.org>

OWNERS

@@ -22,8 +22,8 @@ per-file ninjalog*=tikuta@chromium.org
 per-file post_build_ninja_summary.py=brucedawson@chromium.org
 per-file reclient_helper.py=file://BUILD_OWNERS
 per-file reclient_helper.py=file://RECLIENT_OWNERS
-per-file reclient_metrics.py=file://BUILD_OWNERS
+per-file reclient_metrics*=file://BUILD_OWNERS
-per-file reclient_metrics.py=file://RECLIENT_OWNERS
+per-file reclient_metrics*=file://RECLIENT_OWNERS
 per-file reclientreport*=file://RECLIENT_OWNERS
 
 per-file presubmit*.py=brucedawson@chromium.org