[fix]: UI upgrade now runs as the same user as the js-controller

[foxriver76]

Link the issue which is closed by this PR

See this problem here https://forum.iobroker.net/topic/77574/änderungen-iob-cli-installer-fixer-mit-root-accounts/116?_=1729624052577

Implementation details

Currently the UI upgrade runs as root as the upgrade process needs to be started via systemd to survive the stop of the controller which runs as systemd itself. This has the downside that everything including npm is executed as root.
Hence, the /opt/iobroker/node_modules/iobroker.js-controller/ content and likely other modules touched by npm are now owned by root.

Due to permission errors it seems that the iobroker user cannot read the users file and is not able to start the systemd via sudo -u iobroker leading to

sudo: Unbekannter Benutzer iobroker
sudo: Fehler beim Initialisieren des Audit-Plugins sudoers_audit

Hence, we need another solution. This solution proposed here requires the controller to pass the current uid and gid to the upgrade process which then degrades itself from root to the given gid and uid.

Tests

• I have added tests to avoid a recursion of this bug
• It is not possible to test for this bug

If no tests added, please specify why it was not possible

Would need to upgrade the controller and a specific setup