Don't simulate entity movement when passenger

[AJ-Ferguson]

Fixes #6021

[Copilot]

Pull request overview

This PR fixes a bug where hologram items displayed incorrectly for Bedrock Edition players (issue #6021). When entities are used as passengers (e.g., items in holograms), they should not simulate their own movement. The fix prevents passenger entities from updating their positions based on motion, ensuring they remain properly positioned relative to their vehicle entity.

Changes:

• Added vehicle checks to prevent movement simulation for passenger entities
• Set motion to zero when entities become passengers to clear residual movement

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
JavaSetPassengersTranslator.java	Sets passenger motion to zero when mounting to clear residual movement
ThrowableEntity.java	Skips tick movement simulation when entity is a passenger
ItemEntity.java	Skips tick movement simulation when entity is a passenger
FishingHookEntity.java	Skips tick movement simulation when entity is a passenger
FireballEntity.java	Skips tick movement simulation when entity is a passenger

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