[Retry] Allow infantry to perform type conversion when deploying and undeploying

[DeathFishAtEase]

Reimplement #2239.

• Used a more performant method
• The execution timing of convert was changed from the start of Sequence to after its end

E1↔GGI, YURI↔YURIPR, E2↔BORIS

[github-actions]

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[Coronia]

The performance cost is now resolved

[TaranDahl]

@Starkku Going to merge this in 24h if you have no further instructions.

[Starkku]

Looks correct to me.