Revert "Refactor S3Buffer for export so that it can use different combinations of checksums, compression and encryption (#14862)"#17524

UgnineSirdis merged 1 commit intoydb-platform:stable-25-1ydb-platform/ydb:stable-25-1from

UgnineSirdis:25-1-revert-499b85ea8bc2a2d6f99427c81928535dbba83e1bUgnineSirdis/ydb:25-1-revert-499b85ea8bc2a2d6f99427c81928535dbba83e1bCopy head branch name to clipboard