MDEV-40791 SET GLOBAL innodb_log_archive=OFF triggers full flush

[dr-m]

log_t::set_archive(): When a checkpoint needs to be forced, set a minimum target that guarantees progress, instead of flushing the entire buffer pool. Remove some duplicated reads of last_checkpoint_lsn.

When switching innodb_log_archive from OFF to ON, accurately remember whether any log records may have been written with get_sequence_bit() == 0, to ensure that a checkpoint will be waited for on a subsequent switch from ON to OFF.

log_t::set_recovered(): If innodb_log_archive=ON, only make a future set_archive(false) trigger a checkpoint if we may have recovered a server that was killed between set_archive(true) and write_checkpoint().

[CLAassistant]

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