Set image tag with version instead of latest in Operator chart

[flamarion]

The operator chart uses the 'latest' tag for the 'controller' image by default, instructions were provided to fix this to stable version ahead of the trial.

We do not want to have to maintain both the operator chart version and the controller image version on our side, just the chart version. Otherwise we could end up with a version of the operator chart and the underlying controller image that don't work together.

The idiomatic way to manage this in helm would be for us to manage the chart version only and the chart would publish the associated 'app version' in the helm chart metadata - i notice that 'app version' is set to 1.0.0 in the operator helm chart which is really not accurate as the controller version.