Update CodeQL workflow to use MSBuild (and also fix fix CS1579 and CS0023 errors)

[kenjiuno]

Commented out the Autobuild step and added instructions for using MSBuild instead.

Fix CodeQL Autobuild error:

Node 20 is being deprecated. This workflow is running with Node 24 by default. If you need to temporarily use Node 20, you can set the ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true environment variable. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

And also fix CS1579 and CS0023 errors:

         D:\a\OpenKh\OpenKh\OpenKh.Command.IdxImg\EpicGamesAssets.cs(141,46): error CS1579: foreach statement cannot operate on variables of type 'void' because 'void' does not contain a public instance or extension definition for 'GetEnumerator' [D:\a\OpenKh\OpenKh\OpenKh.Command.IdxImg\OpenKh.Command.IdxImg.csproj]

         D:\a\OpenKh\OpenKh\OpenKh.Tools.Kh2MsetMotionEditor\Usecases\SearchForKh2AssetFileUsecase.cs(77,37): error CS0023: Operator '.' cannot be applied to operand of type 'void' [D:\a\OpenKh\OpenKh\OpenKh.Tools.Kh2MsetMotionEditor\OpenKh.Tools.Kh2MsetMotionEditor.csproj]

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[kenjiuno]

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[kenjiuno]

Ready for merging!