[fxtest] modify the output of  Testing event when running `fx test -pr stats` and ignore the `fx serve` event

Fixed: 477846133
Change-Id: I805bb2159b2dd8c4b29461d1b9d247394a2a4126
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1484976
Commit-Queue: michael liao <weijliao@google.com>
Reviewed-by: Christopher Johnson <crjohns@google.com>
Fuchsia-Auto-Submit: michael liao <weijliao@google.com>
4 files changed