cli: reduce logging for httpx / httpcore

[clementperon]

No description provided.

[Copilot]

Pull request overview

This PR reduces noisy HTTP client logging in the CLI by overriding the log levels for httpx and httpcore after the CLI logging is configured.

Changes:

• Set httpx logger level to WARNING in CLI logging configuration.
• Set httpcore logger level to WARNING in CLI logging configuration.

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[Copilot]

Setting the httpx/httpcore logger levels to WARNING unconditionally can increase verbosity when the requested CLI log level is higher (e.g. ERROR/CRITICAL). In Python logging, parent/root logger levels do not filter propagated records—so a child logger at WARNING will still emit warnings via the root handler even if the root logger is set to ERROR. Consider setting these libraries to max(requested_level, WARNING) (i.e., keep them at least WARNING, but never below the user-requested threshold).