remove namespace analyzer (#8164)

Author: maririos

src/dotnet/Azure.ClientSdk.Analyzers/Azure.ClientSdk.Analyzers.Tests/AZC0001Tests.cs

@@ -7,13 +7,7 @@ namespace Azure.ClientSdk.Analyzers
 {
     internal class Descriptors
     {
-        private static readonly string AZC0001Title = "Use one of the following pre-approved namespace groups (https://azure.github.io/azure-sdk/registered_namespaces.html): " + string.Join(", ", ClientAssemblyNamespaceAnalyzer.AllowedNamespacePrefix);
-
         #region Guidelines
-        public static DiagnosticDescriptor AZC0001 = new DiagnosticDescriptor(
-            nameof(AZC0001), AZC0001Title,
-            "Namespace '{0}' shouldn't contain public types. " + AZC0001Title, DiagnosticCategory.Usage, DiagnosticSeverity.Warning, true);
-
         public static DiagnosticDescriptor AZC0002 = new DiagnosticDescriptor(
             nameof(AZC0002),
             "DO ensure all service methods, both asynchronous and synchronous, take an optional CancellationToken parameter called 'cancellationToken' or a RequestContext parameter called 'context'.",