Change pipeline trigger time to reflect the real trigger time
Description
Currently when a pipeline is triggered the time stamp shows the time of the commit, not when the pipeline was actually triggered.
Proposal
It should reflect the actual time of the trigger. It would be beneficial for things like finding bottlenecks and checking how long pipelines take to run.
Links / references
Zendesk ticket: https://gitlab.zendesk.com/agent/tickets/51044