[BUG][Opensearch] imagePullPolicy not set for fsgroup-volume init container

[gentoo9ball]

Describe the bug imagePullPolicy is not defined for the busybox image used for fsgroup-volume init container. This makes it default to true and not work in an environment without internet.

To Reproduce Steps to reproduce the behavior:

1. Deploy chart with imagePullPolicy set to IfNotPresent
2. Unplug internet
3. Restart
4. See error, fails to pull busybox image

Expected behavior With imagePullPolicy set, it should set it on all containers and therefore not need to re-pull the busybox image. Should be fixed by already referenced PR #417. Thanks, @TheAlgo

Chart Name Opensearch

Host/Environment (please complete the following information):

• Helm Version: v3.11.2
• Kubernetes Version: Microk8s v1.26.3

Additional context Add any other context about the problem here.

[jordarlu]

Can you please have a look on this issue, @TheAlgo. thank you!!

[gentoo9ball]

bump