[turbopack] Rename graph traversal algorithms (#87119)
* remove `traverse_edges_from_entry_dfs` it is dead
* rename a number of traversal methods to shorter names. mostly by dropping `from_entries` which i don't believe is useful.
* rename `travserve_edges_from_entries_dfs_reversed` to `traverse_edges_reverse_dfs` which is a bit better, but could probably still use some work.
I explored ways to share logic across our DFS implementations and ultimately determined that the juice wasn't worth the squeeze
