Help biologists to double check their classification changes

[SamuelNicaise]

When changing a variant's classification, our biologists systematically add a "to_validate" tag so a second biologist can double-check the change, using a filter on that tag.

However, if the first biologist forgets to add the tag, they risk losing track of it before double checking, especially if it is a "-1" classification that removes the variant from their other filters.

I suggested using the history, but a much simpler solution for users would be:

• Add an option in settings that activate the following behavior:
• • When a classification is edited, automatically add a custom tag