Make `sync-all remote set-url` use normalized `/packages/` urls
A simple heuristic (i.e. replacing the `libraries/` suffix by `packages/` in the inferred remotepath, if the remotepath in the `packages` file is "-") used to infer the remotepath for Git submodules. A proper solution would require to parse the `.gitmodules` file to obtain the actual localpath<->remotepath mapping. This addresses #8121 and is a follow-up to a22e908a which changed the `.gitmodules` urls to use the `/packages/` folder instead of `/libraries/`.
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