Always pass as a file for custom executor

Taka Nishidarequested to merge
fix-missing-utf8-bom-for-powershell into main

What does this MR do?

Custom executor creates a file and process it when executing. But, currently, the powershell code treats it not as a file but as stdin. This MR fixes it to process it as a file.

Why was this MR needed?

Fixing bugs related to this.

What's the best way to test this MR?

  • Prepare Windows instance.
  • Build and run pipelines.

What are the relevant issue numbers?

Edited by Taka Nishida

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