Handle permissions API errors gracefully in UpdateUserScopesAsync (#1571)

* Handle permissions API errors gracefully in UpdateUserScopesAsync

When the permissions API returns a 404 for an unrecognized Graph
endpoint, the exception from that single call no longer causes the
entire Task.WhenAll to fail. Instead, the error is logged as a warning
and the endpoint is skipped, allowing the remaining permissions to be
reported correctly.

Fixes #1565

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix double enumeration of deferred task collection

Materialize the task collection with ToArray() and iterate the results
from Task.WhenAll instead of re-enumerating the deferred Select, which
would trigger duplicate HTTP calls.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: waldekmastykarz

DevProxy.Plugins/Utils/GraphUtils.cs

@@ -66,16 +66,23 @@ internal async Task<IEnumerable<string>> UpdateUserScopesAsync(IEnumerable<strin
             _logger.LogDebug("Getting permissions for {Method} {Url}", e.Method, e.Url);
             return $"{url}&requesturl={e.Url}&method={e.Method}";
         });
-        var tasks = urls.Select(u =>
+        var tasks = urls.Select(async u =>
         {
             _logger.LogTrace("Calling {Url}...", u);
-            return _httpClient.GetFromJsonAsync<GraphPermissionInfo[]>(u);
-        });
-        _ = await Task.WhenAll(tasks);
+            try
+            {
+                return await _httpClient.GetFromJsonAsync<GraphPermissionInfo[]>(u);
+            }
+            catch (HttpRequestException ex)
+            {
+                _logger.LogWarning(ex, "Failed to get permissions for {Url}", u);
+                return null;
+            }
+        }).ToArray();
+        var results = await Task.WhenAll(tasks);
 
-        foreach (var task in tasks)
+        foreach (var response in results)
         {
-            var response = await task;
             if (response is null)
             {
                 continue;