Remove BOM from localized files

[martinrrm]

Bug

Fixes:

Description

This PR removes BOM from localized files, since OneLoc task returns localized files with BOM and since VMR change removes the BOM we get loop PR's

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc.

[dotnet-policy-service]

Since this PR is changing CI as it modifies YML files, please verify that you've addressed how this change should apply to release branches. Either:

• Link to equivalent PRs or Issues for each currently supported branch.
  or
• Explain in the PR description why this change doesn't apply to release branches.

[martinrrm]

Arcade PR: dotnet/arcade#16693