fix: use .selectorLabels in selectors

[andybavier]

Description

The CCG Helm chart currently cannot be upgraded. We see this message:

error when patching "/dev/shm/2500439089": Deployment.apps "cluster-connect-gateway-gateway" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app.kubernetes.io/component":"gateway", "app.kubernetes.io/instance":"cluster-connect-gateway", "app.kubernetes.io/managed-by":"Helm", "app.kubernetes.io/name":"cluster-connect-gateway", "app.kubernetes.io/version":"1.1.0-dev-f075b087", "helm.sh/chart":"cluster-connect-gateway-1.1.0-dev"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable

The root cause is that the Helm chart is including selector labels that change per chart version. We should be using the .selectorLabels here instead of .labels.

Fixes # (issue)

Any Newly Introduced Dependencies

Please describe any newly introduced 3rd party dependencies in this change. List their name, license information and how they are used in the project.

How Has This Been Tested?

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Checklist:

• I agree to use the APACHE-2.0 license for my code changes
• I have not introduced any 3rd party dependency changes
• I have performed a self-review of my code