RSpec zero monkey patching mode

What does this MR do?

The plan for RSpec 4.0 is to disable monkey patching: https://rspec.info/blog/2013/07/the-plan-for-rspec-3/#zero-monkey-patching-mode

This commit stops using RSpec monkey patching and enforces the zero monkey patching mode: https://relishapp.com/rspec/rspec-core/docs/configuration/zero-monkey-patching-mode a4d4e984

This commit was created using Transpec:

$ transpec --convert example_group --skip-dynamic-analysis -f spec/ ee/spec/

Closes #220018 (closed)