Add SA for EK

Package Owner Merge Request

Package Changes

https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/merge_requests/50

https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/tags/0.1.16-bb.0

Adds usage of a non-default service account for elastic/kibana + docs on how to use that to set sysctl.

Additional Details

No known issues.

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/issues/14