Use max_query_size from context in DDLLogEntry instead of hardcoded 4096

[Avogar]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Use max_query_size from context in parsing changed settings in DDLWorker. Previously with large number of changed settings DDLWorker could fail with Max query size exceeded error and don't process log entries.

[robot-clickhouse-ci-2]

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[tavplubix]

This is only called on the initiator when enqueueing a query. The purpose of this method is to save changed settings from local context to the entry and propagate them to other hosts. It will not be initialized when parsing the entry

[tavplubix]

We can use Context::getGlobalContextInstance()->getSettingsRef().max_query_size here