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/Scanner/__Libraries/StellaOps.Scanner.Analyzers.Lang.Node/Internal/NodeEnvironmentScanner.cs

@@ -1,10 +1,11 @@
+using System.Globalization;
 using System.Text.RegularExpressions;
 
 namespace StellaOps.Scanner.Analyzers.Lang.Node.Internal;
 
 internal static class NodeEnvironmentScanner
 {
-    private static readonly Regex EnvAssign = new("^\s*(ENV|ARG)\s+NODE_OPTIONS\s*(=|\s)(?<value>.+)$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+    private static readonly Regex EnvAssign = new(@"^\s*(ENV|ARG)\s+NODE_OPTIONS\s*(=|\s)(?<value>.+)$", RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
     public static IReadOnlyList<LanguageComponentRecord> Scan(LanguageAnalyzerContext context, IReadOnlyList<string> sourceRoots, CancellationToken cancellationToken)
     {
@@ -34,6 +35,7 @@ internal static class NodeEnvironmentScanner
 
     private static IEnumerable<LanguageComponentRecord> ScanDockerfile(LanguageAnalyzerContext context, string dockerfile)
     {
+        var results = new List<LanguageComponentRecord>();
         try
         {
             var lines = File.ReadAllLines(dockerfile);
@@ -46,17 +48,20 @@ internal static class NodeEnvironmentScanner
                 }
 
                 var value = match.Groups["value"].Value.Trim().Trim('"', '\'');
-                yield return BuildWarning(context, dockerfile, i + 1, value, source: "Dockerfile", reason: "NODE_OPTIONS");
+                results.Add(BuildWarning(context, dockerfile, i + 1, value, source: "Dockerfile", reason: "NODE_OPTIONS"));
             }
         }
         catch (IOException)
         {
-            yield break;
+            // Ignore IO errors
         }
+
+        return results;
     }
 
     private static IEnumerable<LanguageComponentRecord> ScanEnvFile(LanguageAnalyzerContext context, string envFile)
     {
+        var results = new List<LanguageComponentRecord>();
         try
         {
             var lines = File.ReadAllLines(envFile);
@@ -75,13 +80,15 @@ internal static class NodeEnvironmentScanner
                 }
 
                 var value = parts[1].Trim().Trim('"', '\'');
-                yield return BuildWarning(context, envFile, i + 1, value, source: ".env", reason: "NODE_OPTIONS");
+                results.Add(BuildWarning(context, envFile, i + 1, value, source: ".env", reason: "NODE_OPTIONS"));
             }
         }
         catch (IOException)
         {
-            yield break;
+            // Ignore IO errors
         }
+
+        return results;
     }
 
     private static LanguageComponentRecord BuildWarning(LanguageAnalyzerContext context, string filePath, int lineNumber, string value, string source, string reason)