Refactor error handling in controllers

Removed try-catch blocks from various controller methods to simplify error handling and allow exceptions to propagate naturally. Streamlined error logging and response handling using the `ThenAsync` method, enhancing code readability and reducing redundancy. Adjusted conditional checks for improved clarity.

EnvelopeGenerator.GeneratorAPI/Controllers/AuthController.cs

@@ -118,16 +118,8 @@ public partial class AuthController : ControllerBase
     [HttpPost("logout")]
     public async Task<IActionResult> Logout()
     {
-        try
-        {
-            await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
-            return Ok();
-        }
-        catch (Exception ex)
-        {
-            _logger.LogError(ex, "Unexpected error occurred.\n{ErrorMessage}", ex.Message);
-            return StatusCode(StatusCodes.Status500InternalServerError);
-        }
+        await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
+        return Ok();
     }
 
     /// <summary>