PHP 8.4 deprecation warnings

[joachimVT]

Convert all implicit nullable parameters to explicit nullable type hints (?type) to resolve PHP 8.4 deprecation warnings across AkeneoBundle

[Copilot]

Pull Request Overview

This PR addresses PHP 8.4 deprecation warnings by converting implicit nullable parameters (where default value is null without explicit nullable type hint) to explicit nullable type hints across the AkeneoBundle codebase.

• Adds explicit nullable type hints (?Type) to parameters with null default values
• Updates method signatures in Plugin, Job, Helper, and Console Command classes
• Ensures PHP 8.4 compatibility by following the new strict typing requirements

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
Plugin/Helper/Import/Product.php	Updates $family parameter to use mixed type with null default
Job/SlackMessage.php	Adds nullable Collection type hints for $errorLogs and $processingLogs parameters
Job/SetNotVisible.php	Adds nullable OutputInterface type hint for $output parameter
Job/RunSlackMessage.php	Adds nullable type hints for both $input and $output parameters
Job/ImportMetricUnits.php	Adds nullable OutputInterface type hint for $output parameter
Helper/SlackHelper.php	Adds nullable int type hints for $storeId parameters in two methods
Console/Command/SlackNotificationCommand.php	Adds nullable string type hint for $name parameter in constructor
Console/Command/SetNotVisible.php	Adds nullable string type hint for $name parameter in constructor
Console/Command/ImportMetricUnits.php	Adds nullable string type hint for $name parameter in constructor

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[claudio-ferraro]

Thank you for improving PHP 8.4 support. Really appreciate your contribution!