http-api-client: T8955: harden verify_tls handling

Address the adversarial-review findings on the TLS verification change:

- Finding 1: validate ApiClientConfig.verify_tls in __post_init__. Only a
  bool or a non-empty CA bundle path is accepted; anything else (including
  "", None and ints) raises ValueError. requests treats "" as falsy and
  would silently disable verification. Strings are never coerced: "false"
  is a path, so callers must pass a real bool.
- Finding 2: stop calling urllib3.disable_warnings() process-wide from
  ApiClient.__init__. InsecureRequestWarning is now ignored only around the
  request itself, via warnings.catch_warnings(), and only when verify_tls
  is False. post() is the only request path in the client.
- Finding 3: wrap OSError (raised by requests' cert_verify for a missing
  CA bundle path) in ApiTransportError. The handler sits after the
  RequestException handlers, since those subclass OSError.
- Finding 4: config-sync hard-codes verify_tls = False instead of reading
  an unmapped 'verify_tls' key from the runtime config, whose leaf values
  are strings. Mapping a CLI option to a bool or CA path is T9396.

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