Cookoff - Use getShotInfo for tracer detection

[johnb432]

When merged this pull request will:

• Title.
• Requires Cookoff - Mini-Rewrite #9758.

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[johnb432]

_ammo getShotInfo 4 can't be used, as _ammo is the classname and not the object. We could try to use the HitPart EH, but locality weirdness with that EH is an issue, since HitPart triggers even if allowDamage is false, meaning we'd need to check it manually and given it's local command, we'd need to send events over the network every time.
TLDR: not worth it.