Drop unused directory map

The BazelNetworkReader contains an optimization for reading directories
in case the remote execution (in compatible mode) supports the GetTree
request. This is, however not the case for many remote exeuciton
services, including our own single-node execution service. So the
code is basically untested and rarely used, if at all. Moreover,
justbuild is usually used in native mode and using compatibility
mode is expected to handle tree operations less efficient.

Therefore, remove this basically dead code and decrease complexity
this way.

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