Add gm3 reviewer rotation to watchlist for ui component updates

Bug: 319384095
Change-Id: I9e13cd0e886a99ae2dacfe37e586c4f0daf39b1b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5527021
Commit-Queue: Kim-Anh Tran <kimanh@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>

WATCHLISTS

@@ -22,6 +22,9 @@
     'third_party': {
       'filepath': 'front_end/third_party/',
     },
+    'uielements': {
+      'filepath': 'front_end/ui/components/',
+    }
   },
 
   'WATCHLISTS': {
@@ -29,5 +32,6 @@
     'chromedriver': ['johnchen+watch@chromium.org'],
     'lighthouse': ['lighthouse-eng+devtools-cl@google.com'],
     'third_party': ['devtools-reviews+third_party@chromium.org'],
+    'uielements': ['devtools-gm3-reviewer@rotations.google.com'],
   },
 }