bugfix(contain): Restore retail compatibility after changes to Object::m_containedByID

[Caball009]

• Follow-up PR for: bugfix(object): Avoid crash with dangling contain module in Object::onDestroy() when Reinforcement Pad is destroyed before Troop Crawler drop #2747

PR #2747 forgot to set the containedByID variable for objects that make use of the helix container code. This causes a mismatch for the following 5 replays: replays.zip

This PR adds the same code that was added to Object::onContainedBy to HelixContain::addToContain and HelixContain::addToContainList to fix the issue.

Resetting the contain variables, as is done in the third commit, is not needed to restore retail compatibility. I added that code because I think it's correct to reset the contain variables when the object is removed from its container.

TODO:

• Replicate in Generals.
• Test against replays again.

[greptile-apps]

Greptile Summary

This PR restores retail-compatible Helix containment state handling. The main changes are:

• Adds explicit containment-ID updates for Helix portable structures.
• Clears the serialized containment ID when a portable is removed.
• Moves the containment-pointer setter out of the object headers.
• Mirrors the object-side compatibility changes in Generals.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Contain/HelixContain.cpp	Updates Helix portable add and removal paths to maintain the retail-compatible containment ID.
GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Object.cpp	Moves containment-pointer updates into an out-of-line setter and preserves explicitly maintained IDs during transfer.
GeneralsMD/Code/GameEngine/Include/GameLogic/Object.h	Declares the containment setters used by specialized contain modules.
Generals/Code/GameEngine/Source/GameLogic/Object/Object.cpp	Mirrors the object containment setter and transfer behavior for Generals.
Generals/Code/GameEngine/Include/GameLogic/Object.h	Mirrors the containment setter declarations for Generals.

_{Reviews (9): Last reviewed commit: "Replicated in Generals." | Re-trigger Greptile}

[xezon]

Needs replicate in Generals

[Caball009]

Rebased, and replicated in Generals with two notes:

1. Object::friend_setContainedByID is behind the RTS_ZEROHOUR macro.
2. The changes to HelixContain.cpp are Zero Hour only because Generals doesn't have this file.