fix: always set stripped slashes on http request

- The middleware that takes care of normalizing '//user2/////repo1' to
`/user2/repo1` would only set the normalized value to the Chi (Forgejo's
http router) `RoutePath` field, so Chi would correctly do the routing.
However not all components in Forgejo (like Forgejo's `context` module)
rely on Chi to get this updated path and some still rely on the value of
`(http.Request).URL.Path`, so always set the normalized value to the
http request.
- Adjusted unit test.
- Resolves forgejo/forgejo#6822
- The related issue was caused by
751a3da979/services/context/context.go (L115)
using the value of the http request on not that was set in the Chi context.

services/context/repo.go

@@ -1058,7 +1058,7 @@ func RepoRefByType(refType RepoRefType, ignoreNotExistErr ...bool) func(*Context
 
 			if refType == RepoRefLegacy {
 				// redirect from old URL scheme to new URL scheme
-				prefix := strings.TrimPrefix(setting.AppSubURL+strings.ToLower(strings.TrimSuffix(ctx.Req.URL.Path, ctx.Params("*"))), strings.ToLower(ctx.Repo.RepoLink))
+				prefix := strings.TrimPrefix(setting.AppSubURL+strings.ToLower(strings.TrimSuffix(ctx.Req.URL.Path, ctx.PathParamRaw("*"))), strings.ToLower(ctx.Repo.RepoLink))
 
 				ctx.Redirect(path.Join(
 					ctx.Repo.RepoLink,