Enable the NVCA OTel collector by default for managed clusters

Description

Enable the NVCA Kubernetes event OpenTelemetry collector by default for NGC-managed and Helm-managed cluster sources. Keep explicit enabled: false overrides supported so operators can opt out or roll back without changing chart versions.

The self-managed collector default remains disabled because self-hosted registries may not contain the optional collector image.

Definition of Done

• The operator-level otelCollector.enabled chart default is true.
• The helmManaged.otelCollector.enabled chart default is true.
• Explicit disable overrides still render as disabled.
• The canonical and vendored NVCA Operator charts remain synchronized.
• Chart schema and generated parameter documentation match the new defaults.
• Regression tests cover both chart copies and managed cluster paths.

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Locate the canonical and vendored NVCA Operator charts, then inspect the operator-level and helmManaged otelCollector.enabled defaults, chart schema, and generated parameter documentation. Run the existing regression tests for both chart copies and managed cluster paths first. Done means managed defaults are enabled, self-managed remains disabled, explicit false overrides work, and the chart copies and generated documentation stay synchronized.