Fix Get-ChildItem -Path with wildcard char (#9257)

Unescape non-literal, non-glob path before existence checking.

src/System.Management.Automation/engine/SessionStateContainer.cs

@@ -1478,7 +1478,7 @@ namespace System.Management.Automation
                 string originalPath = path;
                 path =
                     Globber.GetProviderPath(
-                        path,
+                        context.SuppressWildcardExpansion ? path : WildcardPattern.Unescape(path),
                         context,
                         out provider,
                         out drive);
@@ -2441,7 +2441,7 @@ namespace System.Management.Automation
 
                 string providerPath =
                     Globber.GetProviderPath(
-                        path,
+                        context.SuppressWildcardExpansion ? path : WildcardPattern.Unescape(path),
                         context,
                         out provider,
                         out drive);