Fix whitespace trimming in ExpandLocalFeed to prevent path processing issues

Co-authored-by: akoeplinger <[email protected]>

Author: Copilot

src/Cli/dotnet/NugetPackageDownloader/NuGetPackageDownloader.cs

@@ -355,7 +355,7 @@ private IEnumerable<PackageSource> LoadOverrideSources(PackageSourceLocation pac
                 continue;
             }
 
-            PackageSource packageSource = new(source.Trim());
+            PackageSource packageSource = new(source);
             if (packageSource.TrySourceAsUri == null)
             {
                 _verboseLogger.LogWarning(string.Format(
@@ -418,7 +418,7 @@ private List<PackageSource> LoadDefaultSources(PackageId packageId, PackageSourc
                     continue;
                 }
 
-                PackageSource packageSource = new(source.Trim());
+                PackageSource packageSource = new(source);
                 if (packageSource.TrySourceAsUri == null)
                 {
                     _verboseLogger.LogWarning(string.Format(

src/Cli/dotnet/NugetPackageDownloader/PackageSourceLocation.cs

@@ -38,7 +38,7 @@ private static string[] ExpandLocalFeed(string[] sourceFeedOverrides, string bas
             string[] localFeedsThatIsRooted = new string[sourceFeedOverrides.Length];
             for (int index = 0; index < sourceFeedOverrides.Length; index++)
             {
-                string feed = sourceFeedOverrides[index];
+                string feed = sourceFeedOverrides[index].Trim();
                 if (!Uri.IsWellFormedUriString(feed, UriKind.Absolute) && !Path.IsPathRooted(feed))
                 {
                     localFeedsThatIsRooted[index] = Path.GetFullPath(feed, basePath);