Drop FirstTimeMessageAspNetCertificateLinux

As of dotnet/aspnetcore#56582, `--trust` is supported on (key distros of) Linux.
Unofficially, it will likely work on others as well.

Author: amcasey

src/Cli/Microsoft.DotNet.Configurer/DotnetFirstTimeUseConfigurer.cs

@@ -83,14 +83,11 @@ public void Configure()
 
                     if (canShowFirstUseMessages)
                     {
-                        var aspNetCertMessage = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) || RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ?
-                            // The instructions in this message only apply to Windows and MacOS.
-                            LocalizableStrings.FirstTimeMessageAspNetCertificate :
-                            // The instructions in this message only apply to Linux (various distros).
-                            // OSPlatform.FreeBSD would also see this message, which is acceptable since we have no specific FreeBSD instructions.
-                            LocalizableStrings.FirstTimeMessageAspNetCertificateLinux;
+                        // This message is slightly misleading for (e.g.) FreeBSD, which doesn't officially
+                        // support `dotnet dev-certs https --trust`, but the link in the message should help
+                        // users find the right steps for their platform.
                         _reporter.WriteLine();
-                        _reporter.WriteLine(aspNetCertMessage);
+                        _reporter.WriteLine(LocalizableStrings.FirstTimeMessageAspNetCertificate);
                     }
                 }
             }

src/Cli/Microsoft.DotNet.Configurer/LocalizableStrings.resx

@@ -147,9 +147,4 @@ Installed an ASP.NET Core HTTPS development certificate.
 To trust the certificate, run 'dotnet dev-certs https --trust'
 Learn about HTTPS: https://aka.ms/dotnet-https</value>
   </data>
-  <data name="FirstTimeMessageAspNetCertificateLinux" xml:space="preserve">
-    <value>----------------
-Installed an ASP.NET Core HTTPS development certificate.
-To trust the certificate, view the instructions: https://aka.ms/dotnet-https-linux</value>
-  </data>
 </root>