[MOD] modifed plan and insurance usage

Merged Marco Folco requested to merge SOF-46-Remodelar_OS_prestaciones into 12.0-stage

Now the res.partner is a insurance_grouper Each plan has an associated res.partner Modified views, grouper view is a simplified view of the plan partner one Modified views names, 'health insurances' is now 'Groupers' and 'Health Insurance Plans' is now 'Health Insurances'

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