CC-36367 Update topic2table validation error messages

src/main/java/com/snowflake/kafka/connector/Utils.java

@@ -576,6 +576,7 @@ private static GeneratedName generateValidNameFromMap(
   public static Map<String, String> parseTopicToTableMap(String input) {
     Map<String, String> topic2Table = new HashMap<>();
     boolean isInvalid = false;
+    String errorMessage = "";
     for (String str : input.split(",")) {
       String[] tt = str.split(":");
 
@@ -589,32 +590,31 @@ public static Map<String, String> parseTopicToTableMap(String input) {
       String table = tt[1].trim();
 
       if (!isValidSnowflakeTableName(table)) {
-        LOGGER.error(
-            "table name {} should have at least 2 "
-                + "characters, start with _a-zA-Z, and only contains "
-                + "_$a-zA-z0-9",
-            table);
+        errorMessage = "Table name " + table + " should have at least 2 characters, " +
+                "start with _a-zA-Z, and only contains _$a-zA-z0-9";
+        LOGGER.error(errorMessage);
         isInvalid = true;
       }
 
       if (topic2Table.containsKey(topic)) {
-        LOGGER.error("topic name {} is duplicated", topic);
+        errorMessage = "Topic name " + topic + " is duplicated";
+        LOGGER.error(errorMessage);
         isInvalid = true;
       }
 
       // check that regexes don't overlap
       for (String parsedTopic : topic2Table.keySet()) {
         if (parsedTopic.matches(topic) || topic.matches(parsedTopic)) {
-          LOGGER.error(
-              "topic regexes cannot overlap. overlapping regexes: {}, {}", parsedTopic, topic);
+          errorMessage = "Topic regexes cannot overlap. overlapping regexes: " + parsedTopic + ", " + topic;
+          LOGGER.error(errorMessage);
           isInvalid = true;
         }
       }
 
       topic2Table.put(tt[0].trim(), tt[1].trim());
     }
     if (isInvalid) {
-      throw SnowflakeErrors.ERROR_0021.getException();
+      throw SnowflakeErrors.ERROR_0021.getException(errorMessage, null, errorMessage);
     }
     return topic2Table;
   }

src/main/java/com/snowflake/kafka/connector/config/TopicToTableValidator.java

@@ -19,7 +19,7 @@ public void ensureValid(String name, Object value) {
         }
       } catch (SnowflakeKafkaConnectorException e) {
         throw new ConfigException(
-            name, value, "Format: <topic-1>:<table-1>,<topic-2>:<table-2>,...");
+            name, value, e.getExceptionUserMessage());
       }
     }
   }

src/test/java/com/snowflake/kafka/connector/ConnectorIT.java

@@ -413,6 +413,7 @@ public void testInvalidTopicToTableConfigValues() {
     Map<String, String> config = getCorrectConfig();
 
     String[] invalidValues = {
+            "topic1:t1;topic2:t2",          // invalid separator
             "topic1:table1,topic1:table2",  // duplicate topic
             "topic1:!@#@!#!@",              // invalid table name
             "topic1:a",                     // too short table name