[Bug] storage and db containers use core's security context

[andrewazores]

          > https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-container

Maybe it makes sense for us to apply a general Pod security context around everything, and then have optional container security contexts for each container within the Pod:

https://kubernetes.io/docs/tasks/configure-pod-container/security-context/#set-the-security-context-for-a-container

Except for cases like this where we seem to know that a container will not run under the general Pod context, or at least on some common and supported k8s/OCP versions it won't, then we can provide a default for that particular container.

After saying all that, I see we do have separate container security contexts:

https://github.com/cryostatio/cryostat-helm?tab=readme-ov-file#jfr-data-source-container

But the new storage and db containers don't have their own. They are mistakenly reusing the core context.

Originally posted by @andrewazores in #133 (comment)