fix: install filemapper gem and deploy generate-types cronjob

The network module's interfaces provider requires puppetx/filemapper
which was not installed, causing catalog compilation failures with
"no such file to load -- puppetx/filemapper".

Adds filemapper to additional-ruby-gems.sh for puppetserver/compiler
pods, installs it directly in the generate-types cronjob (which has no
access to that script), and adds cronjob_generate-types.yaml to the
kustomization so the CronJob is actually deployed.

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

apps/base/puppet/kustomization.yaml

@@ -7,6 +7,7 @@ resources:
   - cnpg_cluster.yaml
   - cnpg_pooler.yaml
   - cronjob_g10k-code.yaml
+  - cronjob_generate-types.yaml
   - persistentvolumeclaims.yaml
   - vaultauth.yaml
   - vaultstaticsecret.yaml