Add webapks-watchlist watchlist to android_webapk list

Change-Id: I4fa313c41fc3ed776b2e2c0f1370c0a006533824
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1914347
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716092}

WATCHLISTS

@@ -1995,7 +1995,8 @@
     'android_uma_settings': ['asvitkine+watch@chromium.org',
                              'gayane+watch@chromium.org'],
     'android_webapk': ['dominickn+watch-webapk@chromium.org',
-                       'mxcai+watch-webapk@chromium.org'],
+                       'mxcai+watch-webapk@chromium.org',
+                       'webapks-watchlist@chromium.org'],
     'android_webview': ['android-webview-reviews@chromium.org'],
     'android_webview_network_service': ['timvolodine@chromium.org'],
     'animation_worklet': ['yigu@chromium.org',