Increase max_rows_to_read limit in some tests

[Algunenano]

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Increase max_rows_to_read limit in some tests.

Some tests reading from system.text_log, such as 02796_calculate_text_stack_trace, 02581_share_big_sets_between_mutation_tasks_long, 02581_share_big_sets_between_multiple_mutations_tasks_long fail spuriously as they reach this limit.

Introduced in #66837

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[alexey-milovidov]

Can we change it inside tests that read from text_log?

[nickitat]

IMO it either should be global or we need a check like the one for presence of filtering by currentDatabase(), otherwise people will continue to reproduce this issue in every second test.

[alexey-milovidov]

Ok. Although I don't understand this change - if we unlock it in some tests, what is the point for unlocking it globally here?

PS. Anyways, the changes LGTM. Thank you!

[Algunenano]

AFAIK this is not global, it's only used when executing SQL queries inside clickhouse-test (for internal usage).