Verify compression settings used by the client after 25.10

It appears that we don't need to set compress/decompress settings on the transport layer; instead, we can rely on the URL parameter enable_http_compression and the Accept-Encoding/Content-Encoding headers.

NB: 25.10 sets enable_http_compression=1 by default, but it's okay to set it explicitly until the next LTS.

No files or tests are named. Trace the client’s transport configuration and handling of enable_http_compression, Accept-Encoding, and Content-Encoding, then compare the behavior with ClickHouse 25.10 defaults. Done means the client uses the intended URL parameter and headers without unnecessary or incorrect transport-layer compression settings.

Written by the indexing model from the issue text.