fix: run node as root

[rollandf]

With new base image, node pod need to run as root in order to be able to copy the IPAM binary.

[rollandf]

Error:

{"ts":1750315615309.857,"caller":"app/app.go:122","msg":"start IPAM node daemon","v":0,"version":"network-operator-v25.7.0-beta.1(clean,released), commit:e0456281949f0221e5d3c8706188bb6fe73158fd, date:2025-06-18T11:24:05+00:00","node":"c-237-115-40-042","IPPools Namespace":"nvidia-network-operator"}
{"ts":1750315615309.8965,"caller":"app/app.go:346","msg":"failed at nv-ipam copy","err":"cannot create temp file \"_nv-ipam\" in \"/opt/cni/bin\": open /opt/cni/bin/_nv-ipam3608275706: permission denied"}
{"ts":1750315615309.9229,"caller":"cli/run.go:72","msg":"command failed","err":"cannot create temp file \"_nv-ipam\" in \"/opt/cni/bin\": open /opt/cni/bin/_nv-ipam3608275706: permission denied"}

[coveralls]

coverage: 53.048%. remained the same
when pulling f68c58b on rollandf:node-user
into e045628 on Mellanox:main.