Combine webauthn diagnostic commands in a single command

[codingllama]

What would you like Teleport to do?

Combine tsh fido2 diag, tsh touchid diag and tsh webauthnwin diag in a single tsh webauthn diag command. This should make diagnostics both simpler and more informative.

Note that:

• fido2 and webauthnwin are mutually exclusive
• touchid is macOS-exclusive
• webauthnwin is Windows-exclusive

What problem does this solve?

This makes diagnostics simpler to run for end-users (only one command) and more informative.

If a workaround exists, please include it.

Run all the applicable commands individually.

[codingllama]

Follow up from #39629. Nice to have.