feat: change Service selector to 'short' labels collection

[tomasz-spoton]

Rationale:
since there's no way to pin monochart's version (there's no history), deployments of services that line up with new monochart version are potentially unstable because of Service's failure to bind endpoints to pods.

[mrballcb]

Any apps which have been deployed using this will have to be redeployed. To make it non-disruptive, it will have to be a manual series of steps. Is there a list of how many apps have been deployed with this version of the monochart?

Request: Please bump the minor version of monochart in Chart.yaml to reflect that this is a breaking change.

[tomasz-spoton]

@mrballcb

1. are you saying that monochart that is currently pulled reflects the change from this PR?
2. I understand the ask to bump the version, but I am not sure that this is a breaking change - the matching is less restrictive, service resource is mutable and my understanding is that everything is going to be working as prior to the change with the added benefit of not being susceptible to breaking when app's deployment correlates in time with monochart version bump.

[tomasz-spoton]

@mrballcb
could you elaborate? I'm fine with closing this PR if it's disruptive but I'd like to understand what you meant

[mrballcb]

@dalefrancum Can you provide some colour here as to why changing the selector is going to be a problem, or to me why it isn't a problem in this particular case?

[tomasz-spoton]

@mrballcb @dalefrancum
what are the next steps here? Is this acceptable? If not, do you have an alternative solution for me or are you perhaps working on one?