With the asset identifier introduced in the previous commit, we can now
locate an asset just from its `AssetRepresentation`, without requiring
information from the asset library and the file browser storage. With
this we can remove some hacks and function parameters. A RNA/BPY
function is also affected, but I didn't remove the paramter to keep
compatibility. It's simply ignored and not required anymore, noted this
in the parameter description (noted for T102877).
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