chore: add missing error codes for gmc connection api calls

TIS21-5974: Revalidation: Add Error Codes 100 and 160 to list of known GMC errors

src/main/java/uk/nhs/hee/tis/revalidation/connection/entity/GmcResponseCode.java

@@ -31,10 +31,16 @@ public enum GmcResponseCode {
   INTERNAL_ERROR("98", "Internal error"),
   INVALID_CREDENTIALS("99", "Invalid Credentials (user name / password / IP address)"),
   DOCTOR_ALREADY_ASSOCIATED("100", "Doctor already associated with your Designated Body"),
-  MISSING_INTERNAL_USER("110", "Missing Internal User"),
-  MISSING_OR_INVALID_REASON_CODE("120", "Missing / Invalid Change Code (Reason)"),
+  DOCTOR_REVALIDATION_LOCKED("106",
+      "Doctor has a revalidation lock applied. You should call GMC Contact Centre to have this reviewed and/or lifted.")
+
+  MISSING_INTERNAL_USER("110","Missing Internal User"),
+
+  MISSING_OR_INVALID_REASON_CODE("120","Missing / Invalid Change Code (Reason)"),
+
   DOCTOR_NOT_ASSOCIATED_WITH_DESIGNATED_BODY("140",
       "Doctor not associated with your Designated Body"),
+
   DOCTOR_DB_HISTORY_LOCKED("160",
       "Doctor’s DB History is locked, please contact the GMC Revalidation team");
 
@@ -83,4 +89,4 @@ public String getCode() {
   public String getMessage() {
     return message;
   }
-}
+  }