branch-4.1: [fix](be) Skip file cache for http chunk-response readers #66932 - #67190
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### What problem does this PR solve? Issue Number: None Related PR: None Problem Summary: The file-block cache assumes that a reader exposes stable, random-access content. HTTP readers used by CDC TVF chunk responses instead expose a dynamic streaming response. When file cache is enabled, wrapping such a reader with `CachedRemoteFileReader` can make the stream appear empty or reuse invalid cached content. This change adds a reader capability check and skips the file-cache wrapper for HTTP chunk-response readers. Other HTTP file readers continue using the existing cache path. A unit test covers the bypass behavior.
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yiguolei
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Aug 27, 2026
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Cherry-picked from #66932