fix: output valid multiline queries when running SHOW QUERIES

[brianstrauch]

Description

Format multiline queries correctly when running SHOW QUERIES.

ksql> CREATE STREAM S3 AS
SELECT * FROM S1
EMIT CHANGES;

ksql> SHOW QUERIES;
Query ID   | Status  | Sink Name | Sink Kafka Topic | Query String
CSAS_S2_73 | RUNNING | S2        | S2               | CREATE STREAM S2 WITH (KAFKA_TOPIC='S2', PARTITIONS=2, REPLICAS=1) AS SELECT * FROM S1 S1 EMIT CHANGES;

Fixes #4900

Testing done

Wrote new unit tests

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 #")

[ghost]

@confluentinc It looks like @brianstrauch just signed our Contributor License Agreement. 👍

Always at your service,

clabot

[big-andy-coates]

Brilliant. Thanks @brianstrauch. Appreciate your contribution.