Add direct links to logs for logging alerts.
Add direct links to logs for logging alerts.

Canonicalize links for alerts that already had links.

Change-Id: Iac0ae52aee95ed126452853eaaa0a0c6eeed336a
Reviewed-on: https://skia-review.googlesource.com/55104
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Ben Wagner <3ef7217be91069877d94f7907ce5479000772cd3@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot