Enabling VO-agnostic FTS proxy production

[Soap2G]

Closes #220
Tagging @ericvaandering as CMS might be impacted directly.

Changes

• Added conditional statement that checks for "none" option in values.yaml, and if so does not declare RUCIO_VO and RUCIO_FTS_VOMS.
• Changed default values for vo and voms to "none".

Tests

By running

helm template . --kube-version 1.31 --debug --values values.yaml --show-only templates/renew-fts-cronjob.yaml

We get:

env:
  - name: RUCIO_FTS_SCRIPT
    value: "default"
  - name: RUCIO_FTS_VO_COUNT
    value: "1"
  - name: RUCIO_FTS_VO_0
    value: none
  - name: RUCIO_FTS_VOMS_0
    value: none

In which are correctly missing RUCIO_VO and RUCIO_FTS_VOMS.

Follow-up question

Should we avoid creating also RUCIO_FTS_VO/VOMS_{{ $key }}?