[Feature]: Add unit categories governing structure rotation on spawn

### Describe the Feature

In the modding section on discord I have noticed many different people asking to remove structure rotation on spawn or simply finding it ugly/awkward.
There should be 2 new categories to prevent the behavior or trigger only the 90 degree rotation behavior.

### Expected Behavior

Adding this category to a unit prevents it from being rotated by StructureUnit.lua code:
https://github.com/FAForever/fa/blob/a6f714335c76cb47925c9cf5551372d71821fb24/lua/sim/units/StructureUnit.lua#L64-L67

### Screenshots

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### Additional context

_No response_