(MAINT) RSpec testing format parameter

[coreymbe]

Summary

This commit parameterizes the RSpec testing format in the provision::run_tests task to allow users to specify either progress (default) or documentation.

Additional Context

Add any additional context about the problem here.

• The current implementation of the task only allows for RSpec progress output which prints dots (.) for passing examples, F for failures, * for pending. As a user I would like to see more verbose output from the tests I am running. The documentation output prints the docstrings passed to describe and it methods.
• As the task currently hardcodes output to progress, I have ensured this is the default parameter value.

Checklist

• [X] 🟢 Spec tests.
• [X] Manually verified.

[coreymbe]

@gavindidrichsen :: I went ahead and updated the PR comment with a bit more context 😄.

[gavindidrichsen]

@gavindidrichsen :: I went ahead and updated the PR comment with a bit more context 😄.

Love it @coreymbe. Thanks!