BUGFIX: Properly convert legacy MoveNodeMappings

[nezaniel]

…to InterdimensionalSiblings

resolves #5056

This solves the regression introduced in https://github.com/neos/neos-development-collection/pull/4993 by properly evaluating the legacy MoveNodeMappings payload array. Respective tests have been added.

Upgrade instructions

none

Review instructions

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Checklist

• [x] Code follows the PSR-12 coding style
• [x] Tests have been created, run and adjusted as needed
• [x] The PR is created against the lowest maintained branch
• [ ] Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• [ ] Reviewer - The first section explains the change briefly for change-logs
• [ ] Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions