Add integration tests for migration categories and execution

- Implemented MigrationCategoryTests to validate migration categorization for startup, release, seed, and data migrations.
- Added tests for edge cases, including null, empty, and whitespace migration names.
- Created StartupMigrationHostTests to verify the behavior of the migration host with real PostgreSQL instances using Testcontainers.
- Included tests for migration execution, schema creation, and handling of pending release migrations.
- Added SQL migration files for testing: creating a test table, adding a column, a release migration, and seeding data.

src/Cli/StellaOps.Cli/Services/VexObservationsClient.cs

@@ -9,6 +9,7 @@ using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using StellaOps.Auth.Abstractions;
 using StellaOps.Auth.Client;
+using StellaOps.Cli.Extensions;
 using StellaOps.Cli.Services.Models;
 
 namespace StellaOps.Cli.Services;
@@ -20,7 +21,7 @@ namespace StellaOps.Cli.Services;
 internal sealed class VexObservationsClient : IVexObservationsClient
 {
     private readonly HttpClient _httpClient;
-    private readonly ITokenClient? _tokenClient;
+    private readonly IStellaOpsTokenClient? _tokenClient;
     private readonly ILogger<VexObservationsClient> _logger;
     private string? _cachedToken;
     private DateTimeOffset _tokenExpiry;
@@ -33,7 +34,7 @@ internal sealed class VexObservationsClient : IVexObservationsClient
     public VexObservationsClient(
         HttpClient httpClient,
         ILogger<VexObservationsClient> logger,
-        ITokenClient? tokenClient = null)
+        IStellaOpsTokenClient? tokenClient = null)
     {
         _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
         _logger = logger ?? throw new ArgumentNullException(nameof(logger));
@@ -138,20 +139,23 @@ internal sealed class VexObservationsClient : IVexObservationsClient
             return;
         }
 
-        var tokenResult = await _tokenClient.GetAccessTokenAsync(
-            new[] { StellaOpsScopes.VexRead },
-            cancellationToken).ConfigureAwait(false);
+        try
+        {
+            var tokenResult = await _tokenClient.GetAccessTokenAsync(
+                StellaOpsScopes.VexRead,
+                cancellationToken).ConfigureAwait(false);
 
-        if (tokenResult.IsSuccess && !string.IsNullOrWhiteSpace(tokenResult.AccessToken))
-        {
-            _cachedToken = tokenResult.AccessToken;
-            _tokenExpiry = DateTimeOffset.UtcNow.AddMinutes(55);
-            _httpClient.DefaultRequestHeaders.Authorization =
-                new AuthenticationHeaderValue("Bearer", _cachedToken);
+            if (!string.IsNullOrWhiteSpace(tokenResult.AccessToken))
+            {
+                _cachedToken = tokenResult.AccessToken;
+                _tokenExpiry = DateTimeOffset.UtcNow.AddMinutes(55);
+                _httpClient.DefaultRequestHeaders.Authorization =
+                    new AuthenticationHeaderValue("Bearer", _cachedToken);
+            }
         }
-        else
+        catch (Exception ex)
         {
-            _logger.LogWarning("Failed to acquire token for VEX API access.");
+            _logger.LogWarning(ex, "Failed to acquire token for VEX API access.");
         }
     }