Fix PHP 8.4 deprecations by making ImageFactoryInterface parameters explicitly nullable [#3574311]

Updates ImageFactoryInterface method signatures to match ImageFactory and PHP 8.4 requirements by using explicit nullable types (?int
$quality = NULL, ?string $uri = NULL). This removes remaining implicit-nullable deprecation warnings and keeps interface/
implementation signatures consistent.

Issue fork wpf-3574311

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1.2.x changes, plain diff MR !8
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