Fix test_ttl_move::test_alter_with_merge_work flakiness

[azat]

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• Not for changelog (changelog entry is not required)

Cleanup some useless changes, that had been introduced in attempt to fix CI without looking into the problem.

Add some debug info, to make it debuggable.

And increase timeout for TTL DELETE, since otherwise if other routines will
take too long, the part will be removed when it should be still be on
"external" disk:

2024.08.04 03:48:53.803032 [ 622 ] {} <Information> default.mt_test_alter_with_merge_work_1722743323 (9dc6904a-f082-4f06-be7a-efe4733e811c): Will drop empty part all_1_3_4_4

And this is how part_log looks like:

SELECT
    event_time,
    event_type,
    rows,
    part_name,
    error,
    database,
    disk_name
FROM system.part_log
WHERE `table` = 'mt_test_alter_with_merge_work_1722743323'
ORDER BY event_time ASC

Query id: a118b3cd-e4fe-45a5-b675-d73bdd887d79

    ┌──────────event_time─┬─event_type─┬─rows─┬─part_name───┬─error─┬─database─┬─disk_name─┐
 1. │ 2024-08-04 03:48:44 │ NewPart    │    2 │ all_1_1_0   │     0 │ default  │ jbod1     │
 2. │ 2024-08-04 03:48:44 │ NewPart    │    2 │ all_2_2_0   │     0 │ default  │ jbod2     │
 3. │ 2024-08-04 03:48:45 │ NewPart    │    2 │ all_3_3_0   │     0 │ default  │ jbod1     │
 4. │ 2024-08-04 03:48:46 │ MutatePart │    2 │ all_1_1_0_4 │     0 │ default  │ jbod1     │
 5. │ 2024-08-04 03:48:46 │ MutatePart │    2 │ all_2_2_0_4 │     0 │ default  │ jbod2     │
 6. │ 2024-08-04 03:48:46 │ MutatePart │    2 │ all_3_3_0_4 │     0 │ default  │ jbod1     │
 7. │ 2024-08-04 03:48:47 │ MovePart   │    2 │ all_1_1_0_4 │     0 │ default  │ external  │
 8. │ 2024-08-04 03:48:47 │ MovePart   │    2 │ all_3_3_0_4 │     0 │ default  │ jbod2     │
 9. │ 2024-08-04 03:48:47 │ MergeParts │    6 │ all_1_3_1_4 │     0 │ default  │ jbod2     │
10. │ 2024-08-04 03:48:48 │ MovePart   │    6 │ all_1_3_1_4 │     0 │ default  │ external  │
11. │ 2024-08-04 03:48:52 │ MergeParts │    4 │ all_1_3_2_4 │     0 │ default  │ external  │
12. │ 2024-08-04 03:48:53 │ MergeParts │    0 │ all_1_3_3_4 │     0 │ default  │ external  │ # rows==0
13. │ 2024-08-04 03:48:53 │ MergeParts │    0 │ all_1_3_4_4 │     0 │ default  │ external  │
    └─────────────────────┴────────────┴──────┴─────────────┴───────┴──────────┴───────────┘

CI: https://s3.amazonaws.com/clickhouse-test-reports/66671/2f00c962711e13ca00af324366421fe4593b4ce6/integration_tests__tsan__[5_6].html
Fixes: #56686

[robot-ch-test-poll1]

This is an automated comment for commit 062490e with description of existing statuses. It's updated for the latest CI running

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