Remove generation of workbench_nss.conf

Problem

The team-operator is generating /etc/rstudio/workbench_nss.conf (note the underscore) which configures the NSS module to use the HTTP address:

server-address=http://workshop-workbench.posit-team.svc.cluster.local:80

Workbench already auto-generates the correct /etc/rstudio/workbench-nss.conf (note the hyphen) which uses the unix socket:

server-address=unix:/var/run/rstudio-server/rstudio-rserver/user-service.socket
admin-token-path=/etc/rstudio/admin-token
user-token-path=/etc/rstudio/user-token
verify-ssl-certs=1

Using the HTTP address instead of the unix socket is a known deadlock scenario for user provisioning. This was observed during a workshop with ~2,100 users where initial login via Keycloak OIDC/JIT provisioning was failing intermittently (users had to retry 3+ times to successfully sign in).

Expected Behavior

The team-operator should not generate workbench_nss.conf. Workbench handles this automatically and correctly uses the unix socket path by default.

Context

• Observed on the dev.workshop.posit.team deployment
• Environment: Keycloak as IdP, Workbench configured as OIDC client with JIT provisioning
• ~2,107 registered users at the time of the issue
• Slack thread: https://positpbc.slack.com/archives/C0AUN9L3L3G/p1781711339011129

Search the repository for the literal workbench_nss.conf and trace the code that writes it. Confirm the operator no longer produces the underscore-named file while the hyphenated Workbench-managed file remains unaffected, then run the relevant Go tests.