fix: print root cause in error message

[stevenpyzhang]

Description

Lost the root cause for an error during recent refactors. Using the ErrorMessageUtil.buildErrorMessage() to get back the specificity of the error message.

Testing done

before

ksql> CREATE STREAM KS_ORDERS WITH (KAFKA_TOPIC='KS_ORDERS', VALUE_FORMAT='AVRO');
Schema registry fetch for topic KS_ORDERS request failed.

after

ksql> CREATE STREAM KS_ORDERS WITH (KAFKA_TOPIC='KS_ORDERS', VALUE_FORMAT='AVRO');
Schema registry fetch for topic KS_ORDERS request failed.
Caused by: KSQL is not configured to use a schema registry. To enable it, please
        set ksql.schema.registry.url

Reviewer checklist

• Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• Ensure relevant issues are linked (description should include text like "Fixes #")

[spena]

LGTM