Add group-setting support for Sites

[adhilto]

🗣 Description

• Add group-setting support for Sites
• Add detailed report messages for Sites

💭 Motivation and context

Closes https://github.com/cisagov/ScubaGoggles/issues/193. Closes https://github.com/cisagov/ScubaGoggles/issues/88.

📷 Screenshots (if appropriate)

🧪 Testing

• Manually toggled service status for various OUs and groups. In all cases, output was as expected
• Updated unit tests

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] If applicable, All future TODOs are captured in issues, which are referenced in the PR description.
• [x] The relevant issues PR resolves are linked preferably via closing keywords.
• [x] All relevant type-of-change labels have been added.
• [x] I have read and agree to the CONTRIBUTING.md document.
• [x] These code changes follow cisagov code standards.
• [x] All relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [x] Tests have been added and/or modified to cover the changes in this PR.
• [x] All new and existing tests pass.

✅ Pre-merge Checklist

• [x] This PR has been smoke tested to ensure main is in a functional state when this PR is merged.
• [x] Squash all commits into one PR level commit using the Squash and merge button.

✅ Post-merge Checklist

• [x] Delete the branch to clean up.
• [x] Close issues resolved by this PR if the closing keywords did not activate.