fix(otel-agent): use unique otelconfPath on Windows to avoid duplicate volumeMount

[dudo]

What does this PR do?

Fixes the datadog.otelconfPath Helm template to use a unique directory on Windows (C:/ProgramData/Datadog/otel-agent) instead of the same path as datadog.confPath (C:/ProgramData/Datadog).

Motivation

When datadog.otelCollector.enabled=true with targetSystem=windows, the rendered DaemonSet has two volumeMounts on the otel-agent container pointing to the same mountPath:

volumeMounts:
  - name: config
    mountPath: C:/ProgramData/Datadog    # from datadog.confPath
  - name: otelconfig
    mountPath: C:/ProgramData/Datadog    # from datadog.otelconfPath — DUPLICATE

Kubernetes rejects this:

The DaemonSet "datadog-agent-windows" is invalid:
spec.template.spec.containers[3].volumeMounts[3].mountPath:
Invalid value: "C:/ProgramData/Datadog": must be unique

This makes it impossible to deploy DDOT on Windows via the Helm chart.

Reproducer

helm template test datadog/datadog \
  --set targetSystem=windows \
  --set 'datadog.otelCollector.enabled=true' \
  --set 'datadog.apiKeyExistingSecret=x' | \
  kubectl apply --dry-run=server -f -

The fix

On Linux, these paths are already distinct (/etc/datadog-agent vs /etc/otel-agent). This PR applies the same pattern on Windows:

Template	Before	After
datadog.confPath (windows)	C:/ProgramData/Datadog	unchanged
datadog.otelconfPath (windows)	C:/ProgramData/Datadog	C:/ProgramData/Datadog/otel-agent

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add the required chart release artifacts

The project review guide at charts/datadog/docs/internal/agent-review-guide.md says changes to chart templates or chart behavior require a charts/datadog/Chart.yaml version bump, charts/datadog/CHANGELOG.md entry, README regeneration, and updated Datadog Agent baselines. This commit only changes _helpers.tpl, so the Windows DDOT fix can be merged without the release metadata/test artifacts needed for it to be published and verified with the chart.

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