`is_valid_lineage` does not look at `y` and can report `True` for invalid lineages.

[willgraf]

If a lineage contains cell IDs that are not in the label image y, the lineage should be invalid, but is_valid_lineage reports True. This is because y is not passed to is_valid_lineage.

is_valid_lineage should be updated to be passed y, and should make sure:

• all cells in lineage are also in y
• all cells in y are in lineage
• the frames list of each lineage is correct.