tab completion of a provider path notation UNC share name is not possible

related to #7569 and #9881 

# Steps to reproduce
Attempt to tab complete a share name on a UNC path via a partially resolved path that includes the provider notation.

```powershell
get-content Microsoft.PowerShell.Core\FileSystem::\\rk-vs-fs1\ # press tab to cycle through the shares on the server.
```

# Expected behavior

I expected the same completions that I get with
```powershell
get-content \\rk-vs-fs1\ # press tab to cycle through the shares on the server.
```

# Actual behavior

No completions occur

# Analysis

Upon researching leads on #9881, it was noticed that this issue would occur in this code:
https://github.com/PowerShell/PowerShell/blob/981c990d747ae97f56a6c7474e5d2ef04bf237c5/src/System.Management.Automation/engine/CommandCompletion/CompletionCompleters.cs#L4119-L4142
This particular code does not attempt to resolve the path name first to eliminate the potential 'filesystem' provider notation, before checking for a UNC '\\server\share' pattern.

The 'filesystem' provider notation does not affect any other part of the tab completion logic, only the share name completion.

Do note, this code shown above appears to be responsible for #7569, as it fails to escape `$` or spaces in the share names (or any other characters that might be legal in the share name but have a special meaning to PowerShell if not escaped or correctly quoted). 

	// First, try to match \\server\share
	var shareMatch = Regex.Match(wordToComplete, "^\\\\\\\\([^\\\\]+)\\\\([^\\\\]*)$");
	if (shareMatch.Success)
	{
	// Only match share names, no filenames.
	var server = shareMatch.Groups[1].Value;
	var sharePattern = WildcardPattern.Get(shareMatch.Groups[2].Value + "*", WildcardOptions.IgnoreCase);
	var ignoreHidden = context.GetOption("IgnoreHiddenShares", @default: false);
	var shares = GetFileShares(server, ignoreHidden);
	foreach (var share in shares)
	{
	if (sharePattern.IsMatch(share))
	{
	string shareFullPath = "\\\\" + server + "\\" + share;
	if (quote != string.Empty)
	{
	shareFullPath = quote + shareFullPath + quote;
	}

	results.Add(new CompletionResult(shareFullPath, shareFullPath, CompletionResultType.ProviderContainer, shareFullPath));
	}
	}
	}
	else

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tab completion of a provider path notation UNC share name is not possible #10002

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tab completion of a provider path notation UNC share name is not possible #10002

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