fix(container): hidden block mandatory fields blocking item save

[MyvTsv]

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !46553
• Here is a brief description of what this PR does

Root cause

When a block submits no values (e.g. a block not rendered in the form), checkContainerMandatory() still validates its mandatory fields against the persisted values. It does not take the block's display conditions into account: a block hidden by a condition is never rendered, so its mandatory fields can't be filled, and the item save fails with "Some mandatory fields are empty".

Steps to reproduce

1. Create a "Insertion in the form" (dom) block for Tickets with a mandatory field.
2. Add a display condition to the block: hide it when Type = Incident.
3. Create a new ticket with type Incident: the block is not displayed.
4. Save the ticket: the error "Some mandatory fields are empty" appears and the ticket is not created.

Screenshots (if appropriate):

[Rom1-B]

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