bs-tree/node: resolve infinite path loops in `deep_search()`
bs-tree/node: resolve infinite path loops in `deep_search()`

Detect if symlink is being resolved and add it to active symlinks
storage. If we encounter the same symlink on a deeper search level
simply ignore it.

uentity/blue-sky-re,uentity/blue-sky-re,uentity/blue-sky-re