Switch the coverage dashboard to the new one.

This CL updates the url of the coverage dashboard on https://ci.chromium.org/p/chromium/g/main/console

The old one is being deprecated, and will be turned off soon.

Change-Id: I0fd78e8d15cb56dd134a5d86bc6d4e27cc10a1eb
Reviewed-on: https://chromium-review.googlesource.com/c/1482112
Commit-Queue: Shuotao Gao <stgao@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634771}

infra/config/luci-milo.cfg

@@ -100,7 +100,7 @@ headers {
     }
     links {
       text: "coverage"
-      url: "https://chromium-coverage.appspot.com"
+      url: "https://analysis.chromium.org/p/chromium/coverage"
       alt: "Chromium code coverage dashboard"
     }
     links {