QA: "sidewalk=separate is ambiguous about the side"

What is the check here?
I think we need to consider alle `sidewalk=*` tags the same as `sidewalk:both=*`
There is a long discussion on this in https://github.com/openstreetmap/id-tagging-schema/pull/454#issuecomment-2731787841 and https://github.com/openstreetmap/id-tagging-schema/pull/1507

For both, `cycleway` and `sidewalk`, my current take is to consider them the same as their `:both` variants. I hope to some day convince iD to use the more explicit tagging…

So for this check, I think we can just remove it?

Example https://a-b-street.github.io/speedwalk/#17.22/52.562455/13.052818

Review the linked discussions in id-tagging-schema PRs #454 and #1507 to understand the ambiguity around sidewalk=separate. Examine the check in the speedwalk codebase that flags this tag, likely in a validation or mapping logic file. Determine if the check should be removed by comparing with current OSM tagging practices. Test the change using the provided example link to see the impact on sidewalk assessment.

Written by the indexing model from the issue text.