[http2]: enhance error messages on Curl_dyn* upon receiving headers #16536
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This is a partial fix of #16535. The error message format is borrowed from the existing code1.
Sample message before:
curl: (56) process_pending_input: nghttp2_session_mem_recv() returned -902:The user callback function failed
Sample message after:
curl: (56) Failed receiving HTTP2 header: 100(A value or data field grew larger than allowed)