Bug in cf.predict

[grpinto]

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@selmanozleyen

There is a bug when we try to run cf.predict because :

pert covar key == condition_id_key

As a workaround we had to create a new column in both adata and covariate_data with the key. This also happened when computing the embeddings. The bug is probably here bc we try to set an index twice or something similar

CellFlow/src/cellflow/data/_datamanager.py

Line 687 in 0f55ba2

if condition_id_key is not None:

I will create a reproducable unit test and fix this