CmdPal: Refactor PerformanceMonitor extension GPU stats to use batch counter reads (#45835)

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## Summary of the Pull Request

This PR reduces overall CPU usage caused by GPU statistics in
Performance Monitor extension.

Replaces per-instance PerformanceCounter objects with batch reads via
PerformanceCounterCategory.ReadCategory, reducing kernel transitions and
improving efficiency.


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## PR Checklist

- [x] Closes: #45823
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- [ ] **Tests:** Added/updated and all pass
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- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
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- [ ] **Documentation updated:** If checked, please file a pull request
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repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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