python: T8859: raise TypeError/ValueError on invalid min_keysizefix/T8859-dh-keysize-validation

Per dmbaturin's review on
https://github.com/vyos/vyos-1x/pull/5194: the only callers of
verify_diffie_hellman_length() are its own unit tests, so the contract
can change freely. An invalid min_keysize indicates a logic error in
the calling script and should fail loudly instead of silently
returning False:

- signature is now verify_diffie_hellman_length(file: str, min_keysize: int)
- non-integer min_keysize raises TypeError (bool explicitly rejected)
- non-positive min_keysize raises ValueError
- regex pattern converted to a raw string (invalid escape sequence)
- openssl invoked with list arguments instead of an interpolated
  command string, so the file path never hits a shell (CodeRabbit)

Tests updated to pass integer keysizes and extended to cover both
exception paths.

🤖 Generated by [robots](https://vyos.io)

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