tarantool / tarantool / 20351793401

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box: wait for rw state in promote

Previously, `box.ctl.promote()` returned immediately after the
instance became the Raft leader. However, the instance could still be
read-only if it had not yet claimed the synchronous transaction
queue.

This behavior forced users to manually wait for writability after
promotion to avoid errors.

This patch ensures `box.ctl.promote()` waits until the instance is
no longer read-only before returning.

Closes #10040

NO_DOC=bugfix

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