Bringing back .NET 7 sample temporarily

[mattchenderson]

This is to fix an issue in docs that cannot be addressed there right now. Please see me directly for details.

Pull request checklist

• [x] My changes do not require documentation changes
  • [ ] Otherwise: Documentation issue linked to PR
• [x] My changes should not be added to the release notes for the next release
  • [ ] Otherwise: I've added my notes to release_notes.md
• [x] My changes do not need to be backported to a previous version
  • [ ] Otherwise: Backport tracked by issue/PR #issue_or_pr
• [x] I have added all required tests (Unit tests, E2E tests)

[fabiocav]

Following up offline to see if we can reduce the scope of the changes.