Remove USE_NETWORK_INSTANCE for SMF on all docker-compose and helm chart files

Description

After SMF MR !169 is merged, we don't need the USE_NETWORK_INSTANCE parameter anymore.

@defosseu I have removed the value from all the docker-compose files, the config files and the helm chart values, but I have not removed it from docs/results/dsTest/*. Is this part of the repo still updated? It looks outdated, e.g., the SMF IP pool configuration.

Tests

I have manually tested gnbsim attach and ping for all changed docker-compose files. docker-compose-basic-vpp-nonrf.yaml fails, because of a wrong DNN config (see also comment in MR !88 (closed).

@arora I did not test with Kubernetes. Can you check if it still works?

requested review from @arora

assigned to @defosseu

mentioned in merge request oai-cn5g-smf!169 (merged)

@phine_stefan

Perfect --> https://jenkins-oai.eurecom.fr/job/OAI-CN5G-Tutorials-Check-Dev/36/ passing.

Let's merge.

merged

mentioned in commit 52a1be68