Fix RSpec/TimecopTravel offenses

Ref: #214432 (closed)

What does this MR do and why?

This MR fixes the RSpec/TimecopTravel remaining offenses except for qa/spec/support/repeater_spec.rb which I could not fix it entirely yet.

Before	After
Timecop.travel	travel_to

Why are we doing this?

Rails introduced a TimeHelpers so we don't need this gem anymore.

We will remove it in a follow up MR.

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.