Fix TS harvester and MammothMk2 not rendering

[reaperrr]

Fixes #14395.

[penev92]

This needs to go into the first playtest since it fixes a major regression that would otherwise be present in that playtest.

[reaperrr]

it doesn't affect the shipping mods so strictly speaking it's not a hard requirement, but I agree we shouldn't ship a release with this bug.

[Smittytron]

First time I've loaded up TS. Jumpjet Inf, Wolverine, Titan, and Juggernaut all don't render.

[reaperrr]

These are mostly yaml issues, I'll add a Ruleset loading check to avoid these in the future.

With one two exceptions: I don't see why the Jumpjet and Juggernaut don't render, only using CustomRenderSize instead of AutoRenderSize worked for me. The shp bounds themselves can't be the problem (it worked before when AutoSelectionSize was used for render bounds, afterall), so the bug is likely definitely related to handling multiple sprite/infantry bodies on one actor, and RenderSprites.AutoRenderSize.
Maybe some implicit trait order dependency, too. In any case, I can't pin it down so far.

Pinging @pchote for ideas.

[pchote]

Note that I don't get the ping when that is edited in after the first submission 😉

[reaperrr]

The problems with sprite bounds are more complicated, I'll file a separate PR for that so we can get this PR out of the way more quickly.

[penev92]

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