tests: add test for Flatpak-Upgrade-From header on install vs update

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Add an integration test that verifies the Flatpak-Upgrade-From HTTP
header is correctly sent during update operations but absent during
fresh installs. This header is used by Flathub to distinguish updates
from new installs in download statistics.

To support the test, extend web-server.py to optionally log Flatpak-*
request headers to a separate file.

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