Bump test timeout and correct failure message (#8820)
Bump test timeout and correct failure message (#8820)

We already tried bumping this once, but let's give it one more go since
it's still flaking in CI every so often. Also fix the failure message when
it does fail. Which hopefully it won't any more ;-).

Also made failure messages consistent in use of "()" throughout file.
knative/serving,knative/serving