fix(nvca): correct GPU capacity calculation and always include gpuUsage in heartbeat

[estroz]

TL;DR

Cherry pick of #1161

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Issues

Relates to #1152

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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