[mapper] Add tq tasks flavors into titles.
[mapper] Add tq tasks flavors into titles.

Makes GAE logs when looked at at glance more informative.

R=40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org

Change-Id: I9dabd51b11092afa218eac03cb2aad42bc9114e3
Reviewed-on: https://chromium-review.googlesource.com/c/1273929
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go