[IMP-REM] crm, * : remove stage based probability and add won_stage bool field on crm.stage

This commit prepares the next Predictive Lead Scoring (aka PLS) ones.
With the new PLS implementation, stage based probablility is not relevant anymore
as the probability will be computed based on multiple criteria
following the Naive Bayes probabilist theorem.
To determine if the stage is a won stage, a new 'won_stage' boolean field replaces
the old probability field that is now removed.
won_stage = True is equivalent to stage.probability = 100.

Task ID : 1925439
PR #33589

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