[BUG] OASIS-to-BIDS informative logs are not relevant

[AliceJoubert]

Currently, the converter only indicates :

• Clinical data conversion
• The difference between the result and clinical data (see issue Noisy and useless summary when specifying a list of subjects manually  #249) -> too much noise !
• Missing metadata for all subjects in clinical data -> too much noise too !

[github-actions]

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