Add time-travel RSpec helpers to testing best practices docs
requested to merge add-info-about-new-time-travel-rspec-metadata-tags-to-the-testing-guide-best-practices into master
What does this MR do and why?
Adds information about the new :freeze_time and :time_travel_to
RSpec metadata tag helpers for reducing the boilerplate code needed to
wrap specs with these time-travel helpers.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.