Deprecate methods and streamline controller code

Added [Obsolete("Use MediatR")] attribute to several methods
across `DocumentController`, `HomeController`,
`TestConfigController`, `TestDocumentReceiverElementController`,
and `TestEnvelopeController` to indicate they should no longer
be used.

Refactored constructors in `TestConfigController` and
`TestEnvelopeController` to remove unnecessary empty blocks.

Improved formatting and structure of the `GetAll` method in
`TestEnvelopeController` for better clarity while maintaining
functionality.

Updated `Program.cs` to suppress warnings about obsolete
types/members during service registrations, indicating a
transition to newer implementations.

EnvelopeGenerator.Web/Program.cs

@@ -98,6 +98,7 @@ try
     });
 
     // Add envelope generator services
+#pragma warning disable CS0618 // Type or member is obsolete
     builder.Services.AddEnvelopeGeneratorInfrastructureServices((provider, options) =>
     {
         var logger = provider.GetRequiredService<ILogger<EGDbContext>>();
@@ -106,8 +107,11 @@ try
                .EnableSensitiveDataLogging()
                .EnableDetailedErrors();
     });
+#pragma warning restore CS0618 // Type or member is obsolete
 
+#pragma warning disable CS0618 // Type or member is obsolete
     builder.Services.AddEnvelopeGeneratorServices(config);
+#pragma warning restore CS0618 // Type or member is obsolete
 
     builder.Services.Configure<CookiePolicyOptions>(options =>
     {
@@ -174,7 +178,10 @@ try
     builder.Services.AddSingleton(sp => sp.GetRequiredService<IOptions<Cultures>>().Value);
 
     // Register mail services
+#pragma warning disable CS0618 // Type or member is obsolete
     builder.Services.AddScoped<IEnvelopeMailService, EnvelopeMailService>();
+#pragma warning restore CS0618 // Type or member is obsolete
+
     builder.Services.AddDispatcher<EGDbContext>();
 
     builder.Services.AddMemoryCache();
@@ -183,7 +190,9 @@ try
 
     builder.ConfigureBySection<AnnotationParams>();
 
+#pragma warning disable CS0618 // Type or member is obsolete
     builder.Services.AddUserManager<EGDbContext>();
+#pragma warning restore CS0618 // Type or member is obsolete
 
     var app = builder.Build();