fix: Update TFS URI handling in TfsEmbededImagesTool.cs

Modified the condition for validating `matchedSourceUri` to check if its `PathAndQuery` starts with "/tfs" instead of looking for "tfs/DefaultCollection". This change enhances the flexibility of URI processing for TFS.

Author: luxdave

src/MigrationTools.Clients.TfsObjectModel/Tools/TfsEmbededImagesTool.cs

@@ -132,7 +132,7 @@ private string UploadedAndRetrieveAttachmentLinkUrl(string matchedSourceUri, str
                 {
                     if (!string.IsNullOrEmpty(sourcePersonalAccessToken))
                     {
-                        if (!string.IsNullOrEmpty(sourcePersonalAccessToken) && matchedSourceUri.Contains("tfs/DefaultCollection"))
+                        if (!string.IsNullOrEmpty(sourcePersonalAccessToken) && new Uri(matchedSourceUri).PathAndQuery.StartsWith("/tfs/"))
                         {
                             string credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", "", sourcePersonalAccessToken)));
                             httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", credentials);