feat: Add support for standalone chart labels

[as51340]

Release note

Users can now set custom pod and statefulset labels on the standalone chart.

Related product PRs

PRs from product repo this doc page is related to:
memgraph/helm-charts#252

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	May 28, 2026 10:31am

[vpavicic]

If no release note is needed, it can be merged

[as51340]

release note under helm chart PR