Resolve "Annotate Mattermost Operator pods with Istio version"

Package Merge Request

https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost-operator/-/merge_requests/35

Package Changes

Added statement to add istio annotations if istio injected pods in the mattermost-operator namespace.

For Issue

Closes #973 (closed)