Rename getVersion to getNormalizationVersion.

This change improves clarity by making the method name more descriptive and aligned with its purpose. All relevant interfaces, classes, and tests have been updated accordingly to reflect this renaming.

src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/StepFilterOnDate.php

@@ -111,7 +111,7 @@ class StepFilterOnDate implements FilterInterface
         ];
     }
 
-    public function getVersion(): int
+    public function getNormalizationVersion(): int
     {
         return 1;
     }

src/Bundle/ChillPersonBundle/Export/Filter/AccompanyingCourseFilters/UserJobFilter.php

@@ -144,7 +144,7 @@ final readonly class UserJobFilter implements FilterInterface, DataTransformerIn
         ];
     }
 
-    public function getVersion(): int
+    public function getNormalizationVersion(): int
     {
         return 1;
     }