Limit parsing threads for distibuted case

[ianton-ru]

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):

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Documentation entry for user-facing changes

More than one parsing thread prevents parallel loading on secondary nodes
https://github.com/ClickHouse/ClickHouse/blob/master/src/Processors/Formats/Impl/ParquetBlockInputFormat.cpp#L586
https://github.com/ClickHouse/ClickHouse/blob/master/src/Processors/Formats/Impl/ParquetBlockInputFormat.cpp#L923

By the way, non-distributed request calculate number of parsing thread based on unknown estimated_keys_count (size_t max - https://github.com/ClickHouse/ClickHouse/blob/master/src/Storages/ObjectStorage/StorageObjectStorageSource.cpp#L682)

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[altinity-robot]

This is an automated comment for commit a502980 with description of existing statuses. It's updated for the latest CI running

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[Enmk]

LGTM