Update Swashbuckle and improve generated OpenAPI files (#6066)

* Improve generated OpenAPI files

* Nullable

* Fmt

* Correct powershell command

* Fix name

* Add some tests

* Fmt

* Switch to using json naming policy

test/SharedWeb.Test/SourceFileLineOperationFilterTest.cs

@@ -0,0 +1,33 @@
+using Bit.SharedWeb.Swagger;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+
+namespace SharedWeb.Test;
+
+public class SourceFileLineOperationFilterTest
+{
+    private class DummyController
+    {
+        public void DummyMethod() { }
+    }
+
+    [Fact]
+    public void AddsSourceFileAndLineExtensionsIfAvailable()
+    {
+        var methodInfo = typeof(DummyController).GetMethod(nameof(DummyController.DummyMethod));
+        var operation = new OpenApiOperation();
+        var context = new OperationFilterContext(null, null, null, methodInfo);
+        var filter = new SourceFileLineOperationFilter();
+        filter.Apply(operation, context);
+
+        Assert.True(operation.Extensions.ContainsKey("x-source-file"));
+        Assert.True(operation.Extensions.ContainsKey("x-source-line"));
+        var fileExt = operation.Extensions["x-source-file"] as Microsoft.OpenApi.Any.OpenApiString;
+        var lineExt = operation.Extensions["x-source-line"] as Microsoft.OpenApi.Any.OpenApiInteger;
+        Assert.NotNull(fileExt);
+        Assert.NotNull(lineExt);
+
+        Assert.Equal(11, lineExt.Value);
+        Assert.StartsWith("test/SharedWeb.Test/", fileExt.Value);
+    }
+}