Add Repository Count to "devopsmigration discovery inventory" Command

[Copilot]

Changes Made

This PR enhances the devopsmigration discovery inventory command to include repository counts in the output. Previously, the command only provided work item counts, but now it also includes repository information.

Implementation Details:

1. Added a new method to the ICatalogService interface:

   IAsyncEnumerable<ProjectDiscoverySummary> CountRepositoriesAsync(string orgUrl, string project, string pat, CancellationToken cancellationToken = default);

2. Implemented the method in CatalogService class using the GitHttpClient to retrieve repositories:

   public async IAsyncEnumerable<ProjectDiscoverySummary> CountRepositoriesAsync(
       string orgUrl,
       string project,
       string pat,
       [EnumeratorCancellation] CancellationToken cancellationToken = default)
   {
       var credentials = new VssBasicCredential(string.Empty, pat);
       var connection = new VssConnection(new Uri(orgUrl), credentials);
       var gitClient = connection.GetClient<GitHttpClient>();
   
       ProjectDiscoverySummary repoStats = new ProjectDiscoverySummary();
       
       // Get all repositories for the project
       var repositories = await gitClient.GetRepositoriesAsync(project, cancellationToken: cancellationToken);
       
       // Set the repository count
       repoStats.ReposCount = repositories.Count;
       repoStats.IsRepoComplete = true;
       repoStats.LastUpdatedUtc = DateTime.UtcNow;
       
       yield return repoStats;
   }

3. Updated InventoryCommand.cs to call the new method and incorporate repository counts in the output table.

Output Format:

The command now displays the repository count in both the console table output and the CSV export. The table already had a "Repos" column defined, which is now populated with the actual repository count data.

Fixes #5.

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