Fix snapshot install in Keeper

[antonio2368]

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• 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):

Keeper fix: Correctly apply preprocessed requests after a snapshot from leader is installed. Bug found by Jepsen.

Uncommitted ZXIDs can be different on different nodes, so we need to use log idx when we are applying uncommitted requests after a snapshot install.

https://s3.amazonaws.com/clickhouse-test-reports/53049/1494eb3a864caa53cf8734e13f97f6e08b24a47a/clickhouse_keeper_jepsen.html
In Jepsen we saw a leader node storing some logs and preprocessing them, but it was partitioned from other nodes so it couldn't replicate them. Other node become leader and sent a snapshot to old leader but ZXIDs were out of sync so old leader applied too many old logs.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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