Replicate snapshot history in Mistral AI

[MattiSG]

As seen in OpenTermsArchive/GenAI-declarations#149, Mistral AI consolidated all their terms in a single document between 2024-02-27T12:30:52Z and 2024-02-27T18:30:53Z. We thus have lost versions between that date and the date of merge.

Turns out, we did track the snapshots (see OpenTermsArchive/GenAI-snapshots@4bf6716) since the document used for consolidation was already a source. We should make sure that that snapshot is used for all other terms.