Disable monkey patching in RSpec
Disable monkey patching in RSpec

This change
- stops exposing DSL globally
- disables should and should_not syntax for rspec-expectations
- disables stub, should_receive, and should_not_receive syntax for rspec-mocks

I'm making this change mainly to enforce more consistent syntax in our specs

More: https://www.relishapp.com/rspec/rspec-core/v/3-0/docs/configuration/zero-monkey-patching-mode

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