Fix Keeper snapshot size in mntr

[antonio2368]

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):

Keeper fix: return correct value for zk_latest_snapshot_size in mntr command

Fix #50314

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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---

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• Exclude: Stateful tests
• Exclude: Performance tests
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---

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[robot-ch-test-poll2]

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Check name	Description	Status
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Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	❌ failure
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Successful checks

Check name	Description	Status
A Sync	If it fails, ask a maintainer for help	✅ success
Bugfix validation	Checks that either a new test (functional or integration) or there some changed tests that fail with the binary built on master branch	✅ success
ClickBench	Runs [ClickBench](https://github.com/ClickHouse/ClickBench/) with instant-attach table	✅ success
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