Fix network timeouts
It solves issue described by https://gitlab.com/gitlab-com/infrastructure/issues/2318#note_35610216.
ResponseHeaderTimeout needs to be significantly longer than long-polling, as if we end connection prematurely we end-up with jobs being stuck: marked as running, but not received by the runner.
Closes https://gitlab.com/gitlab-com/infrastructure/issues/2318
Edited by Kamil Trzciński (Back 2025-01-01)