[autoroll] Add alert for > consecutive roll CL upload failures
[autoroll] Add alert for > consecutive roll CL upload failures

Bug: skia:10298
Change-Id: Id2e5cef06226ada41455908e2c0b1d3c7765a0d5
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/293240
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@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