Add YT_OPERATION_TRANSACTION_ID to job environment

I have an operation that acquires a lock during start to ensure that no two operations are running concurrently. After the lock is acquired, transaction that was used for locking is used as a prerequisite.

Now I have to start such a per-operation transaction manually, however there are already operation-specific transactions that are managed by scheduler. We can pass id of such transaction to job environment and use it.