Add runtimeClassName support to helm chart

[dnskr]

Is your feature request related to a problem? Please describe.
The feature request related to the problem with files relabeling when MinIO pods run on nodes with enabled SELinux.
The solution described in the discussions and require runtimeClassName to be set on MinIO pods.

Describe the solution you'd like
Add runtimeClassName value to minio helm chart.

[steve-gray]

As per #15217 and the associated discussions, without this work to enable skipping of most of the leg-work of an SELinux relabel, it's essentially impossible to use Minio in any modern managed Kubernetes environment. As most platforms default to an SELinux variant (EKS, OCI/EKS, AKS etc....), it essentially means a restart of Minio with a scaled number of files can take exponential amounts of time, and lead to low availability of the service.

[harshavardhana]

This is a low priority to get runtimeClassName support for vanilla helm chart - it's the operator issue minio/operator#1194 that is of high priority.