RSpec: Show time overall spent creating factories per run

What does this MR do and why?

This commit enables the "Nate Heckler" mode for test-prof to print to following summary after each run:

[TEST PROF INFO] Time spent in factories: 04:31.222 (54% of total time)

This is to encourage us to fix your factories as soon as possible.

See https://test-prof.evilmartians.io/#/profilers/factory_prof?id=instructions

Refs #373184 (comment 1096642633)

Screenshots or screen recordings

Last line of

bin/rspec spec/models/key_spec.rb

How to set up and validate locally

bin/rspec spec/models/key_spec.rb

Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}

Randomized with seed 27958

Test environment set up in 5.58437905 seconds
..........................................................................................

Finished in 11.22 seconds (files took 6.39 seconds to load)
90 examples, 0 failures

Randomized with seed 27958

[TEST PROF INFO] Time spent in factories: 00:01.353 (11.48% of total time)

MR acceptance checklist

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