Changes

open5gs-master: useradd: don't hardcode uid

Give the user that runs open5gs a different UID than the build user from
the debian-bookworm-build container.

Fix for:
useradd: UID 1000 is not unique

Related: OS#6057
Change-Id: I49051e038740cfccbb11ad33a1884bb7de318710

open5gs-master: drop unknown option metrics_impl

The metrics_impl option has been dropped in the related commit as
prometheus is now the default in open5gs. With newer meson, unknown
options are treated as errors (used to be warnings before).

Fix for:
ERROR: Unknown options: "metrics_impl"

Related: OS#6057
Related: https://github.com/open5gs/open5gs/commit/982ac61894ba5ac7b532661773df0cae859bb4f1
Change-Id: Ib859ef7389928019addecae08df2011eecda80ad