Transition `.taskcluster.yml` from v0 to v1

[owlishDeveloper]

Documentation for v0: click
Documentation for v1: click

[owlishDeveloper]

@clrmachado This issue is yours!

[owlishDeveloper]

An example https://github.com/taskcluster/json-parameterization/pull/9/files

[clrmachado]

Thanks @owlishDeveloper!

[clrmachado]

I've noticed that there is no replacement for event.head.user.email any particular user I should set it to or should I use nobody@mozilla.com like in the shared example?