Issue 34304: #3223 Fix Functional test failures in CI

- Narrowed the scope of PowerShell cert usage to just the .NET Framework
  versions without the CertificateRequest API.

Author: paulmedynski

src/Microsoft.Data.SqlClient/tests/tools/Microsoft.Data.SqlClient.TestUtilities/Fixtures/CertificateFixtureBase.cs

@@ -50,7 +50,7 @@ protected static X509Certificate2 CreateCertificate(string subjectName, IEnumera
 
             rnd.NextBytes(passwordBytes);
             password = Convert.ToBase64String(passwordBytes);
-#if NET9_0
+#if NET || NET472_OR_GREATER
             X500DistinguishedNameBuilder subjectBuilder = new X500DistinguishedNameBuilder();
             SubjectAlternativeNameBuilder sanBuilder = new SubjectAlternativeNameBuilder();
             RSA rsaKey = RSA.Create(2048);