feat(nvca): add first-class BYOO chart values

[kristinapathak]

TL;DR

• Adds typed top-level byoo values for collector resources, log chunking, collector rendering, and capacity overhead.
• Renders those values into the existing agent config ConfigMap, so other generated configuration remains intact.
• Keeps legacy BYOO fields in agentConfig.mergeConfig for one minor release. Legacy values take precedence during the transition and cause a once-per-resource-version operator warning.

Additional Details

The generated Helm chart is regenerated from the native source. The native chart now carries an existing PodDisruptionBudget template and defaults so vending preserves current chart output.

For the Reviewer

Please review the chart composition helpers and ConfigMap template, the RBAC reader using the composed config, and the operator warning guard.

For QA

• Passed helm lint, make test-first-class-byoo-values, make test-self-managed-nvca-image-reference, make lint, and make validate.
• Passed focused Go test for the warning guard.
• go test ./pkg/operator/reconcile is blocked by the existing test harness inability to patch os.Exit in this environment.
• QA needed: No. Render and focused unit coverage are included.

Issues

Closes #969

Checklist

• I am familiar with the Contributing Guidelines.
• I have signed off my commits for Developer Certificate of Origin (DCO) compliance.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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