mendersoftware / mender / 2734681275

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fix(http): time out stalled transactions without killing switched protocols

A server that accepts a request and never answers left the response read
outstanding forever, wedging the client until restart. Arm Beast's stream timeout
per operation and disarm it at the 101 Switching Protocols handover -- leaving it
armed there closed mender-connect's WebSocket after five minutes and got the
previous attempt reverted (MEN-9433).

Backport note: common::def_value does not exist on 5.0.x, so it comes over from
master too. A plain default member initializer would not do, since Debug builds
use C++11, where that stops ClientConfig being an aggregate.

Ticket: ME-731
Changelog: Fixed the client hanging indefinitely when a server accepts a request but
never sends a response, which left the device unmanageable until it was restarted.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Signed-off-by: Nick Anderson <nick@cmdln.org>
(cherry picked from commit c7a9290d3)

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