(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

• 🟢 Spec tests.
• Manually verified.

[gavindidrichsen]

@coreymbe. Great work here! Would you mind adding a bit more explanation in the PR to explain the context and consequences of your change? Context: What motivated this decision? What were you trying to do that didn't work without this? Consequences: What becomes easier now (or more difficult)? Any risks introduced by the change that will need to be mitigated? The reason I'm asking for this is because we'd like to start keeping track of our design decisions and the context and consequences. See here for an example of the sort of design decision I'm talking about.

After that I'm happy to merge it in!

[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!