Add Confidence level on Users

[Jipegien]

Use case

Users have a Max Confidence level that will be used when creating Knowledge.
As connectors, stream and feeds used a user to upsert data, confidence level in their config is no longer needed. They will use the max confidence level of the users they are associated with.

In User's edition form, a dedicated panel allows to set the max confidence level

No migration

We do not know what is the value used in the connectors configuration files of our users, and we cannot know which user is used for a connector, thus we cannot magically migrate the existing users with a smart max confidence value.
For instance, migrating users to 100 would be a very dangerous move as connectors would suddenly be able to overwrite all data in the platform.

For this reason, no migration will be executed. Platform admins are expected to configure their confidence policy throughout their platform.

Subtasks:

• Managing a “max confidence level” for a user
• Enforce specific rights to manage confidence levels of users (capability SETACCESS)
• [Product] Anticipate the breaking change using Filigran's communication tools

Linked to issues

• Managing max confidence level at Group level #4901
• Add admin tools for managing Groups and Users max confidence levels #5692
• Add per-entity overrides for user and group confidence level #5694
• Assert User's confidence when updating or inserting data in the platform #5695
• Assert associated User's confidence when ingesting data from streams, feeds and connectors #5697
• Enforce input validation against schema for patching object attributes #5696

Next steps

• Using max confidence level of the associated user when upserting data
• Taking into account the max confidence level of users when they try to modify the confidence level of an Object

Further comments

Note this feature will then be leveraged for #2517 in the future.

[SamuelHassine]

Also implement the option "validate_before_import".