Fix - User field updates and email import

[RomainLvr]

Checklist before requesting a review

Please delete options that are not relevant.

• 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 !40971
• Here is a brief description of what this PR does

Apply #538 for the plugin version compatible with GLPI 11

[Copilot]

Pull request overview

This PR applies fixes from a related pull request to make the DataInjection plugin compatible with GLPI 11. The changes focus on improving user field handling, email imports, and preventing data corruption during user updates.

Key changes:

• Refactored the isNullable() method to properly identify non-nullable fields and prevent empty string insertion
• Enhanced email import functionality to support multiple email addresses with validation
• Added token field filtering to prevent double encryption issues

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
inc/userinjection.class.php	Refactored nullable field logic, added email multi-value support with validation, and implemented token field filtering
inc/commoninjectionlib.class.php	Improved empty value handling to correctly treat 0 as a valid value, and skip empty values for non-nullable fields during updates
inc/clientinjection.class.php	Fixed URL parameter encoding by removing HTML entity encoding (Twig handles this automatically)

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