[mlir][affine] Add dependency on `UBDialect` for `PoisonAttr` (#77691)

The folder for `AffineApplyOp` will try creating a `PoisonAttr`
under certain circumstances. However, this will result in a crash if the
`UBDialect` isn't loaded.

This patch adds a dependency of `AffineDialect` on `UBDialect`.