http: consolidate nghttp2_session_mem_recv() call paths

Previously there were several locations that called
nghttp2_session_mem_recv and handled responses slightly differently.
Those have been converted to call the existing
h2_process_pending_input() function.

Moved the end-of-session check to h2_process_pending_input() since the
only place the end-of-session state can change is after nghttp2
processes additional input frames.

This will likely fix the fuzzing error. While I don't have a root cause
the out-of-bounds read seems like a use after free, so moving the
nghttp2_session_check_request_allowed() call to a location with a
guaranteed nghttp2 session seems reasonable.

Also updated a few nghttp2 callsites to include error messages and added
a few additional error checks.

Closes #5648

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