Use VOMS2CS agent

Seems our custom solution is not needed and diracx comes with an agent to sync user DNs.

https://github.com/DIRACGrid/diracx/blob/5e48a4e7fb0e2617b097e44f4de6305ffdfd71a6/docs/admin/how-to/install/register-a-vo.md?plain=1#L6

• enable the agent in the values https://gitlab.cta-observatory.org/cta-computing/dpps/workload/wms/-/blob/main/chart/values.yaml?ref_type=heads#L411
• add the agent DIRAC configuration in the configmap and update eventual other necessary configuration in the DIRAC config
• update the iam values to add the voms.role label
• remove the custom IAM sync job and scripts -> but first try by just disable the bootstrap job