BEP: Sets `start_time` on `BuildStarted` events from `NoBuildEvent`
When handling invocations we noticed some invocations still weren't setting start_time on BuildStarted. We specifically noticed this on build event streams from query invocations. After some spelunking I found NoBuildEvent, which didn't get updated with the rest of the codebase in e5c832a16e475f636c845b0247731f65df5e258c.
cc @lfpino
Hi @iamricard Could you please sign the CLA?
I have signed it.
bump @sgowroji
I have signed it.
@Yannic Can you also sign your contribution?
@sgowroji I amended the commit to use Yannic's EngFlow email
