Added test attachment version

Author: hkarthik7

azd/src/main/java/org/azd/common/ApiVersion.java

@@ -51,6 +51,7 @@ public abstract class ApiVersion {
     public static final String SECURITY = "7.1-preview.1";
     public static final String SERVICE_ENDPOINTS = "7.1-preview.4";
     public static final String SERVICE_HOOKS = "7.1-preview.1";
+    public static final String TEST_ATTACHMENTS = "7.1";
     public static final String TEST_RUNS = "7.1-preview.3";
     public static final String VARIABLE_GROUPS = "7.1-preview.2";
     public static final String WIKI = "7.1-preview.2";