allow manually triggering inference tasks

[cigale-reports]

the behavior of only launching classification on cropped image makes sense but can be confusing, so we could add a button to manually add images to the task queue. we could also thus disable automatic classification/detection if needed

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Issue created by gwennlbh via Discord:

Re, du coup je disais, il faut obligatoirement faire un recadrage pour utiliser la classif ?

— Tifaeris (tifaeris.)