Remove score property from Observables

[Jipegien]

Use case

Observables is not something to score. It is observed, or it is not. To assess if an Observable is associated with malicious practices, the Indicator Object must be used.

CTI sources provide Indicator with a "relevance" score. Detection systems provides Observables that have been seen in logs Observables matches Indicators' pattern

To implement: removing score from Observable schema and views.

[nino-filigran]

@labo-flg use case for deprecation