Update CELab tests ownership

Change-Id: I602cd2b07029fc7319a916ed95f5bb5f0b6ec440
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068656Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Xiang Ji <jxiang@google.com>
Cr-Commit-Position: refs/heads/master@{#743690}

chrome/test/enterprise/OWNERS

 jxiang@google.com
 asanka@chromium.org
-feiling@chromium.org
+uwyiming@google.com
 
 # COMPONENT: Enterprise

chrome/test/enterprise/e2e/OWNERS

 jxiang@google.com
-feiling@chromium.org
+uwyiming@google.com
 
 # COMPONENT: Enterprise