x/sys/windows/svc: Fix IsWindowsService() to be aligned with dotnet 6

[gillg]

The curret IsWindowsService() method was inherited from the legacy .NET fwk and not compatible inside windows containers. We need to update it to be go x/sys compatible inside containers.

Fixes #56335

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Patch Set 1: Run-TryBot+1

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Patch Set 1: TryBot-Result+1

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