Method PurgeTrashAsync(long, int, int, IProgress<PurgeProgress>?, CancellationToken)

Purge a trash container created by SoftDeleteAsync.
Physically deletes objects in batches with progress callback.

public Task PurgeTrashAsync(long trashId, int totalCount, int batchSize = 10, IProgress<PurgeProgress>? progress = null, CancellationToken cancellationToken = default)