feat: add chart values to manage labels and annotations

[kalexmills]

Without the ability to pass additional command-line arguments to the manager, installing HNC using a tool like ArgoCD requires developers to maintain their own fork.

This is a targetted PR relating to #385 for the special case of managed annotations and labels.

A separate PR could be used in lieu of this change, for passing any and all 'extraArgs' to the HNC controller that may be needed, now or in future. #387. I'll leave the choice of which to merge to the maintainers.

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