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Stop treating asset hash collisions as errors

Feedback from Robert on Discord[1] is that hash collisions can be very common for certain mods.

Since erroring causes that archive's assets to be ignored, it results in less accurate sorting behaviour than not erroring, and if there are many hash collisions then logging them just produces noise.

Instead, count the number of collisions and debug log a single statement if it's non-zero, so there's still some indication to aid debugging any unexpected sorting behaviour it causes.

[1]: https://discord.com/channels/473542112974077963/473542230095822848/1498060566344896673

The linked Discord message (and a few following messages) is:

> pretty sure for Skyblivion we have > Many duplicates all over our files
and i mean A LOT
> but 100s of thousands of files that i'd expect
> [...]
> quirks of the hashing formula the game uses
>
> -- Robert in #support at 2026-04-27, 21:36 PM

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12344 of 13106 relevant lines covered (94.19%)

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