Address test failures on Windows and Linux

Author: edwardneal

src/Microsoft.Data.SqlClient/tests/FunctionalTests/AlwaysEncryptedTests/SqlColumnEncryptionCertificateStoreProviderShould.cs

@@ -397,7 +397,9 @@ public void TestValidCertificatePaths(string certificateStoreNameAndLocation, ob
             }
             else
             {
-                certificateStoreLocation = StoreLocation.CurrentUser;
+                certificateStoreLocation = Environment.OSVersion.Platform == PlatformID.Win32NT
+                    ? StoreLocation.LocalMachine
+                    : StoreLocation.CurrentUser;
             }
 
             // Fetch the newly created cert.

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

@@ -51,7 +51,7 @@ protected static X509Certificate2 CreateCertificate(string subjectName, IEnumera
 
             rnd.NextBytes(passwordBytes);
             password = Convert.ToBase64String(passwordBytes);
-#if NET9_0_OR_GREATER
+#if NET
             X500DistinguishedNameBuilder subjectBuilder = new X500DistinguishedNameBuilder();
             SubjectAlternativeNameBuilder sanBuilder = new SubjectAlternativeNameBuilder();
             RSA rsaKey = RSA.Create(2048);
@@ -84,8 +84,22 @@ protected static X509Certificate2 CreateCertificate(string subjectName, IEnumera
             // This is to ensure that it's imported into the certificate stores with its private key.
             using (X509Certificate2 ephemeral = request.CreateSelfSigned(notBefore, notAfter))
             {
-                return X509CertificateLoader.LoadPkcs12(ephemeral.Export(X509ContentType.Pkcs12, password), password,
+#if NET9_0_OR_GREATER
+                return X509CertificateLoader.LoadPkcs12(
+                    ephemeral.Export(X509ContentType.Pkcs12, password),
+                    password,
+                    X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable,
+                    new Pkcs12LoaderLimits(Pkcs12LoaderLimits.Defaults)
+                    {
+                        PreserveStorageProvider = true,
+                        PreserveKeyName = true
+                    });
+#else
+                return new X509Certificate2(
+                    ephemeral.Export(X509ContentType.Pkcs12, password),
+                    password,
                     X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
+#endif
             }
 #else
             // The CertificateRequest API is available in .NET Core, but was only added to .NET Framework 4.7.2; it thus can't be used in the test projects.