PowerToys.MonacoPreviewHandler crashes when rendering UTF-8 BOM

[crutkas]

Summary of the Pull Request

PR Checklist

• [ ] Closes: https://github.com/microsoft/PowerToys/issues/35258
• [ ] Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• [ ] Tests: Added/updated and all pass
• [ ] Localization: All end user facing strings can be localized
• [ ] Dev docs: Added/updated
• [ ] New binaries: Added on the required places
  • [ ] JSON for signing for new binaries
  • [ ] WXS for installer for new binaries and localization folder
  • [ ] YML for CI pipeline for new test projects
  • [ ] YML for signed pipeline
• [ ] Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[crutkas]

this should test but for some reason, i can't get monaco to work on this computer currently even on .90.1, quickly whipped up a bom file in theory to test creating a file with utf-8 BOM.txt

[crutkas]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[lei9444]

Tested and LGTM