BitBucket service should use generic 'sticky' implementation

[michaelvl]

BitBucket requires sticky sessions on the web interface. The bitbucket service have the following values in values.yaml:

Service:
Annotations:
traefik.backend.loadbalancer.sticky: "true"

This should be replaced with a 'sessionAffinity: ClientIP' on the service since this is a generic, non-traefik specific solution.