fix: change locate() error message for a more user-friendly message

[spena]

Description

What behavior do you want to change, why, how does your patch achieve the changes?
Fixes #6249

Add a better error message when the issue in #6249 is thrown.

ksql> CREATE TABLE MSG_COUNT WITH (KAFKA_TOPIC='MSG_COUNT', PARTITIONS=1, REPLICAS=1) AS SELECT
  'X' X,
  COUNT(*) MSG_CT
FROM PAGEVIEWS PAGEVIEWS
GROUP BY 'X'
EMIT CHANGES;

ksql> SELECT * FROM MSG_COUNT WHERE X='X';
Materialized data for key ['X'] is not available yet. Please try again later.

There was another fix that retry the failing request here (#6633), but seems pull queries must fail fast. Instead, the user should be warned about the issue and let them know they need to retry.

Testing done

Uni tests
Manually

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]

I removed the state store %s because seems not useful for the user. The LOG will print it in the ksql.log debugging purposes.

[AlanConfluent]

LGTM