Enabling RSpec MultipleDescribes and renaming errors_spec.rb file

[GarryHurleyJr]

Rework of PR #9743

https://docs.rubocop.org/rubocop-rspec/cops_rspec.html#rspecmultipledescribes

What are you trying to accomplish?

The RSpec/MultipleDescribes rubocop rule was disabled for the errors_spec.rb file. This PR replaces that file with an appropriately named file (RSpec/FilePath cop compliance) and fixes the multiple describes issue within by nesting the describe statements.

Anything you want to highlight for special attention from reviewers?

Rework of PR #9743

How will you know you've accomplished your goal?

This rule will effectively run on the whole ecosystem and no tests will be affected.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.