Add VolumetricViewer to Admin Experimental Features flags

[kieftrav]

Staging branch URL: https://pr-7171.pfe-preview.zooniverse.org

Describe your changes

Adds a toggle in the Admin section called "VolumetricViewer". This is to be used in FEM for displaying the new VolumetricViewer subject viewer. A separate ADR is not part of this PR because it will be added to the VolumetricViewer ADR when the VolumetricViewer is added to FEM.

How To Review

Go to the staging branch and see that 1) the toggle is in the admin area and 2) see that it is enabled for the project "VV Production".

Required Manual Testing

• Does the non-logged in home page render correctly?
• Does the logged in home page render correctly?
• Does the projects page render correctly?
• Can you load project home pages?
• Can you load the classification page?
• Can you submit a classification?
• Does talk load correctly?
• Can you post a talk comment?

Review Checklist

• Does it work in all major browsers: Firefox, Chrome, Edge, Safari?
• Does it work on mobile?
• Can you npm ci and app works as expected?
• If the component is in coffeescript, is it converted to ES6? Is it free of eslint errors? Is the conversion its own commit?
• Are the tests passing locally and on GitHub Actions?

Optional

• Have you replaced any ChangeListener or PromiseRenderer components with code that updates component state?
• If changes are made to the classifier, does the dev classifier still work?
• Have you resized and compressed any image you've added?
• Have you added in flow type annotations?
• Have you followed the Springer guidelines for commit messages?

[coveralls]

coverage: 56.725%. remained the same
when pulling bea75d0 on volumetric-viewer-admin-flag
into 4b7c6b9 on master.

[shaunanoordin]

PR Review

This PR adds the "VolumetricViewer" option to the list of experimental tools on the Projects admin page (example).

• The addition of this VolumetricViewer option doesn't actually affect anything else in the PFE codebase, and is only of interest in the FEM codebase.

Status

Changes are pretty straightforward for PFE, so this PR looks good to me. 👍

That said, @kieftrav, please be sure to cross-link this PR to/with any ADRs or associated PRs on FEM (whenever they're ready), so someone looking at this specific PFE PR on Github has a trail to follow to the main FEM documentation.

I'll follow up later with more questions about documentation, as this will need to be added to the How-To-Zoo. 📖