[mlir][linalg][transform] PackGreedilyOp/TileToForallOp: Store payload ops in SmallVector

The TrackingListener removes ops from the internal transform dialect state when they are erased. At the same time, the `apply` interface method is iterating over all payload ops. Elements may not be removed from the state while iterating over the state.

Differential Revision: https://reviews.llvm.org/D148771