Update CONTRIBUTING.md for better guidance for new contributors

[benjagm]

Summary

We are making it more clear for new contributors the conditions to work on an Issue and submit a PR.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (72ae168) to head (cbc0f51).

Additional details and impacted files

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[gregsdennis]

I also noticed that the triage process doesn't say anything about discussing solutions to identify the actions that need to take place. The status goes from "triage" to "available". I think there should be an "in discussion" step that indicates, "Yes this is a valid issue, but we're uncertain how we want to address it. Opinions are welcome."

[Relequestual]

I think these changes are helpful.
What do you think about also modifying the PR template to add some comments which directs people to the contribution guide?