Add NSwag client test

[martincostello]

• Add a test that uses an NSwag-generated client.
• Move/rename the tests to avoid ambiguity with the NSwag client.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (a15b386) to head (c6532e9).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3689   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files         111      111           
  Lines        3861     3861           
  Branches      779      779           
=======================================
  Hits         3655     3655           
  Misses        206      206           

Flag	Coverage Δ
Linux	94.66% <ø> (ø)
Windows	94.66% <ø> (ø)
macOS	94.66% <ø> (ø)

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[Copilot]

Pull request overview

This PR adds NSwag client generation and testing capabilities alongside the existing Kiota client, and reorganizes the test structure to clearly distinguish between the two client types.

• Adds NSwag as a code generation tool with corresponding test suite
• Renames Kiota client namespace from TodoApp.Client to TodoApp.KiotaClient for clarity
• Consolidates client generation into a single script supporting both Kiota and NSwag

Reviewed changes

Copilot reviewed 39 out of 39 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
.config/dotnet-tools.json	Adds NSwag.ConsoleCore v14.6.3 as a dotnet tool
generate-todo-clients.ps1	New unified script that generates both Kiota and NSwag clients
generate-todo-client.ps1	Removed old Kiota-only generation script
KiotaClientTests.cs	New test file containing Kiota client integration tests (moved from CodeGenerationTests.cs)
NSwagClientTests.cs	New test file containing NSwag client integration tests
CodeGenerationTests.cs	Refactored to only verify generated client snapshots, removing actual API tests
KiotaTodoClient/**/*.cs	Updated namespace from TodoApp.Client to TodoApp.KiotaClient
NSwagTodoClient/**/*.cs	New NSwag-generated client code in TodoApp.NSwagClient namespace
snapshots/**/*.verified.cs	New snapshot files for both Kiota and NSwag generated clients

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[Copilot]

Redundant call to 'ToString' on a String object.

[Copilot]

Redundant call to 'ToString' on a String object.

[Copilot]

Field '_httpClient' can be 'readonly'.

Suggested change

	private System.Net.Http.HttpClient _httpClient;
	private readonly System.Net.Http.HttpClient _httpClient;

[Copilot]

Field '_settings' can be 'readonly'.

Suggested change

	private static System.Lazy<Newtonsoft.Json.JsonSerializerSettings> _settings = new System.Lazy<Newtonsoft.Json.JsonSerializerSettings>(CreateSerializerSettings, true);
	private static readonly System.Lazy<Newtonsoft.Json.JsonSerializerSettings> _settings = new System.Lazy<Newtonsoft.Json.JsonSerializerSettings>(CreateSerializerSettings, true);