Drop Selenium-based UI tests

Selenium-driven UI tests don't run reliably on Linux; the UI tests in
FirstUIStript.cs were flaky and time-consuming without catching real
regressions. The maintained UI going forward is PostIt, which is tested
via its own PostIt.Tests project.

Removed:
- src/Yavsc.Org.Tests/FirstUIStript.cs (the Selenium-based FirstScript class)
- Selenium.WebDriver PackageReference from Yavsc.Org.Tests.csproj
- Selenium.WebDriver version from src/Yavsc.Org.Tests/Directory.Packages.props

WebServerFixture, BaseTestContext, and the integration tests that depend
on them (Remoting, Services, EMailling, etc.) are unaffected.

src/Yavsc.Org.Tests/Directory.Packages.props

@@ -8,7 +8,6 @@
     <PackageVersion Include="Microsoft.Extensions.Caching.Memory" Version="10.0.9" />
     <PackageVersion Include="Microsoft.Extensions.Options" Version="10.0.9" />
     <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="10.0.9" />
-    <PackageVersion Include="Selenium.WebDriver" Version="4.45.0" />
     <PackageVersion Include="xunit.v3.common" Version="3.2.2" />
     <PackageVersion Include="xunit.v3.extensibility.core" Version="3.2.2" />
   </ItemGroup>

src/Yavsc.Org.Tests/FirstUIStript.cs

@@ -1,76 +0,0 @@
-
-    /* Buggy
-using OpenQA.Selenium;
-using OpenQA.Selenium.Chrome;
-using OpenQA.Selenium.Firefox;
-
-namespace yavscTests.ServerFixtures;
-
-[Collection("Yavsc Server")]
-
-public class FirstScript : BaseTestContext
-{
-
-    public readonly WebServerFixture _serverFixture;
-    readonly ITestOutputHelper _output;
-
-    IWebDriver driver = new ChromeDriver();
-    public FirstScript(ITestOutputHelper output, WebServerFixture fixture) : base(output, fixture)
-    {
-        _serverFixture = fixture;
-        this._output = output;
-    }
-
-    [Fact]
-    public  void DoTestSeleniumWebSite()
-    {
-        var firefoxOptions = new ChromeOptions();
-        firefoxOptions.AcceptInsecureCertificates = true;
-        firefoxOptions.AddArgument("--headless=new");
-        var driver = new ChromeDriver(firefoxOptions);
-
-        driver.Navigate()
-        .GoToUrl(_serverFixture.Addresses.FirstOrDefault(u => u.StartsWith("http:")));
-
-        driver.Quit();
-    }
-    
-
-
-    // FIXME [Fact]
-    public async Task DoTestYavscSite()
-    {
-       
-
-        var firefoxOptions = new FirefoxOptions
-        {
-            AcceptInsecureCertificates = true
-        };
-
-        var driver = new FirefoxDriver(firefoxOptions);
-
-        var url = _serverFixture.Addresses.FirstOrDefault(u => u.StartsWith("http:"));
-        Assert.NotNull(url);
-        //driver.Navigate().GoToUrl(url);
-driver.Navigate().GoToUrl("http://localhost:5000/Home/About");
-        var title = driver.Title;
-
-        driver.Manage().Timeouts().ImplicitWait = TimeSpan.FromMilliseconds(500);
-
-        var navbar = driver.FindElement(By.Id("navbar"));
-        Assert.NotNull(navbar);
-        *//*     
-                var textBox = driver.FindElement(By.Name("my-text"));
-                var submitButton = driver.FindElement(By.TagName("button"));
-
-                textBox.SendKeys("Selenium");
-                submitButton.Click();
-
-                var message = driver.FindElement(By.Id("message"));
-                var value = message.Text;
-                    *//*  
-        driver.Quit();
-    }
-
-}
-*/

src/Yavsc.Org.Tests/Yavsc.Org.Tests.csproj

@@ -17,7 +17,6 @@
     </PackageReference>
     <PackageReference Include="Microsoft.NET.Test.Sdk" />
     <PackageReference Include="IdentityModel.OidcClient" />
-    <PackageReference Include="Selenium.WebDriver" />
     <PackageReference Include="Microsoft.AspNetCore.Hosting" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" />
     <PackageReference Include="Microsoft.Extensions.Options" />