Check for non-Azure Storage backends

[cgillum]

The Durable commands currently only work with the Azure Storage backend, and not when users configure alternate backends, like MSSQL or Netherite. This PR adds detection for those other backend types and returns an error if the user tries to run a command against function apps that use those other backend types.

Issue describing the changes in this PR

(I'm not aware of any issue opened for this)

Pull request checklist

• [ ] My changes do not require documentation changes
  • [ ] Otherwise: Documentation issue linked to PR
• [ ] My changes do not need to be backported to a previous version
  • [ ] Otherwise: Backport tracked by issue/PR #issue_or_pr
• [ ] I have added all required tests (Unit tests, E2E tests)