Function wait_for_all_regions_evicted

pub async fn wait_for_all_regions_evicted(
    greptime: MySqlPool,
    selected_datanode: u64,
    timeout: Duration,
)

Waits until all regions are evicted from the specified datanode.

This function repeatedly checks the number of partitions on the specified datanode and waits until the count reaches zero or the timeout period elapses. It logs the number of partitions on each check.