generate key for clickhouse_remove_objects_capability

[CheSema]

Changelog category (leave one):

• Improvement

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

instead using a constant key, now object storage generates key for determining remove objects capability.

[robot-ch-test-poll4]

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Successful checks

Check name	Description	Status
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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
Stress test	Runs stateless functional tests concurrently from several clients to detect concurrency-related errors	❌ failure

[CheSema]

I have doubts here according PlainS3. Need to check it works right with PlainS3 before merge.