Code coverage improvements (#121)

These are test-only changes to improve code coverage so I'll merge directly.  Please review the commit and I'll pickup those changes in the next iteration.

* Add integration test batch file

* Exclude Linux and MacOS from Windows code coverage builds

* Enable code coverage for test driver e2e tests

* Use the windows only build for code coverage runs

test/Microsoft.SqlTools.ServiceLayer.Test/Credentials/Linux/LinuxInteropTests.cs

@@ -15,23 +15,25 @@ namespace Microsoft.SqlTools.ServiceLayer.Test.Credentials
         [Fact]
         public void GetEUidReturnsInt()
         {
+#if !WINDOWS_ONLY_BUILD           
             TestUtils.RunIfLinux(() =>
             {
                 Assert.NotNull(Interop.Sys.GetEUid());
             });
+#endif           
         }
 
         [Fact]
         public void GetHomeDirectoryFromPwFindsHomeDir()
         {
-
+#if !WINDOWS_ONLY_BUILD
             TestUtils.RunIfLinux(() =>
             {
                 string userDir = LinuxCredentialStore.GetHomeDirectoryFromPw();
                 Assert.StartsWith("/", userDir);
             });
+#endif
         }
-        
     }
 }