#1709 - Add commonName to dnsNames in Certificate manifest to comply with ACME

[JoshuaSmeda]

This PR updates the Helm chart’s Certificate manifest to include the commonName in the dnsNames list.
Currently, cert-manager issues a warning and ACME rejects the CSR because the commonName (metrics-server) is not present in the SANs list.
By ensuring the commonName is also included under dnsNames, the certificate request complies with ACME requirements for cert-manager.

Fixes #1709

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• ✅login: JoshuaSmeda / name: Joshua Smeda / (61a7bff)

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[stevehipwell]

Thank for the PR @JoshuaSmeda. Could you please add an entry to the chart CHANGELOG under the unreleased heading to cover the change you're making?