Add ability to override tag for the controller image

[alpeb]

Currently the container images in the manifests for the linkerd core controllers have their tags parametrized to {{.Values.linkerdVersion}}. There are circumstances (like pointed out here) were we'd like to override this. The solution would be to add something like a controllerImageVersion entry in values.yaml with an empty string default, and use that in the templates if non-empty (via helm's default function).

[utibeabasi6]

hey
i would like to work on this if its still open
maybe some guidance to help me get started

[wasup-yash]

This issue seems to be resolved, as per this

[alpeb]

Fixed by #11406