TST: manual workflow to install latest RC from test pypi

[jklenzing]

Description

Adds a new workflow to install the RC through the test pypi server for each major operating system. Designed to catch any issues that may stem from improper local build and upload.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Github Actions

Checklist:

• [x] Make sure you are merging into the develop (not main) branch
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] Add a note to CHANGELOG.md, summarizing the changes
• [x] Update zenodo.json file for new code contributors

[jklenzing]

Pinging @rstoneback @aburrell @JonathonMSmith. This should close one of the gaps in our RC testing before releases, and should probably be deployed across the ecosystem. I'm not sure if we should have any other tests here, or if installing from test pypi is sufficient.

[jklenzing]

I've updated comments in all the workflow files accordingly.