Ignore multi choice test for mssql (#7449)

#### Rationale
Ignore multi choice test for mssql

Author: DariaBod

study/test/src/org/labkey/test/tests/study/StudyDatasetsTest.java

@@ -17,13 +17,15 @@
 package org.labkey.test.tests.study;
 
 import org.jetbrains.annotations.Nullable;
+import org.junit.Assume;
 import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 import org.labkey.test.BaseWebDriverTest;
 import org.labkey.test.Locator;
 import org.labkey.test.TestFileUtils;
+import org.labkey.test.WebTestHelper;
 import org.labkey.test.categories.Daily;
 import org.labkey.test.components.LookAndFeelScatterPlot;
 import org.labkey.test.components.LookAndFeelTimeChart;
@@ -186,6 +188,7 @@ public void testDatasets()
     @Test
     public void testDatasetWithMultiChoice()
     {
+        Assume.assumeTrue("Multi-choice text fields are only supported on PostgreSQL", WebTestHelper.getDatabaseType() == WebTestHelper.DatabaseType.PostgreSQL);
         OptionalFeatureHelper.enableOptionalFeature(getCurrentTest().createDefaultConnection(), "multiChoiceDataType");
         String datasetName = "Test dataset";
         DatasetDesignerPage definitionPage = _studyHelper.goToManageDatasets()