CsWin32 should not wrap output handles with SafeHandle on errors

Actual behavior

/// <inheritdoc cref="CreatePipe(winmdroot.Foundation.HANDLE*, winmdroot.Foundation.HANDLE*, winmdroot.Security.SECURITY_ATTRIBUTES*, uint)"/>
[SupportedOSPlatform("windows5.0")]
internal static unsafe winmdroot.Foundation.BOOL CreatePipe(out Microsoft.Win32.SafeHandles.SafeFileHandle hReadPipe, out Microsoft.Win32.SafeHandles.SafeFileHandle hWritePipe, winmdroot.Security.SECURITY_ATTRIBUTES? lpPipeAttributes, uint nSize)
{
	winmdroot.Foundation.HANDLE hReadPipeLocal;
	winmdroot.Foundation.HANDLE hWritePipeLocal;
	winmdroot.Security.SECURITY_ATTRIBUTES lpPipeAttributesLocal = lpPipeAttributes.HasValue ? lpPipeAttributes.Value : default(winmdroot.Security.SECURITY_ATTRIBUTES);
	winmdroot.Foundation.BOOL __result = WindowsPInvoke.CreatePipe(&hReadPipeLocal, &hWritePipeLocal, lpPipeAttributes.HasValue ? &lpPipeAttributesLocal : null, nSize);
	hReadPipe= new Microsoft.Win32.SafeHandles.SafeFileHandle(hReadPipeLocal, ownsHandle: true);
	hWritePipe= new Microsoft.Win32.SafeHandles.SafeFileHandle(hWritePipeLocal, ownsHandle: true);
	return __result;
}

Expected behavior

MSDN documentation for CreatePipe states:

If CreatePipe fails, the contents of the output parameters are indeterminate. No assumptions should be made about their contents in this event.

CsWin32 should not assume that those output parameters will simply contain invalid handles.

Repro steps

1. NativeMethods.txt content:

CreatePipe

Context

• CsWin32 version: 0.1.619-beta
• Win32Metadata version (if explicitly set by project): 15.0.22-preview
• Target Framework: net6.0
• LangVersion (if explicitly set by project): preview

Start by reproducing the issue with a NativeMethods.txt containing CreatePipe, then trace the CsWin32 source-generator path that emits wrappers for output handles. Compare the generated wrapper with the CreatePipe failure contract shown in the issue. Done means failed calls do not blindly wrap indeterminate output parameters as SafeHandles, with coverage for this repro.