This changes the default value and the local `gitlab.ingress.enabled`
implementation to result in:

* Ingress is enabled by default in both standalone usage and when used
  as subchart.
* In standalone mode: Ingress can be disabled by setting
  `ingress.enabled=false`.
* In subchat mode: Ingress can be controlled via
  `global.ingress.enabled` and local overrides (`openbao.ingress.enabled`)
  take presedence.

Fix Ingress default handling

See merge request !60

OpenBao maintainers as code owners

See merge request gitlab-org/cloud-native/charts/openbao!61

Upgrade to gitlab-openbao:v2.4.4-gitlab1

See merge request !62