feat(serviceAccount): support custom annotations on the service account

[mtblz]

Add a serviceAccount.annotations value and render it onto the ServiceAccount metadata. Enables setting annotations natively (e.g. an AWS IRSA eks.amazonaws.com/role-arn) instead of patching the chart-created SA after install. Defaults to {} so existing releases are unaffected.

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Pull request overview

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Adds first-class support for custom Kubernetes ServiceAccount annotations in the Netdata Helm chart, enabling use-cases like AWS IRSA without post-install patching.

Changes:

• Introduces serviceAccount.annotations in values.yaml with a default of {}.
• Renders serviceAccount.annotations into the ServiceAccount manifest metadata when provided.
• Documents the new value in the chart README values table.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
charts/netdata/values.yaml	Adds serviceAccount.annotations value with an empty-map default.
charts/netdata/templates/serviceaccount.yaml	Conditionally renders annotations under ServiceAccount metadata.
charts/netdata/README.md	Documents the new serviceAccount.annotations chart value.

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