Handle late ClickHouse HTTP exceptions - #403
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Detects ClickHouse exceptions that are appended after a
200 OKresponse has begun, including the deliberate connection close used to signal an incomplete HTTP response. For the defaultRowBinaryWithNamesAndTypesformat, the response exception tag is passed into the decoder and the trailer is validated against that tag, its recorded message length, and ClickHouse's 16 KiB bound before returningCh.Error; unmatched truncation remains a Mint transport error. Gzip and Zstandard RowBinary response bodies are supported, while non-RowBinary formats retain their existing behavior. Adds a tagged real-ClickHouse regression test and excludes it on the older CI server version.