512 - fix to allow helm upgrades

upstream added a label to their jaeger-operator.labels helper function. This breaks helm upgrades, as the label is used in the immutable selector field of the Deployment.

The solution is to create a separate helper which is used in the selector to allow helm upgrades to work

Verified the helm upgrade path worked correctly now, and I can reach the UI web server pods through the virtual service on tracing.bigbang.dev