Remove redundant loading of .osrm.cell_metrics

When using process memory, MLD cell metrics are loaded twice from
.osrm.cell_metrics - once when loading static data, and again when
loading updatable data. The former appears to be the mistake,
as .osrm.cell_metrics is only listed in `GetUpdatableFiles`.

CHANGELOG.md

@@ -3,6 +3,7 @@
     - Misc:
       - FIXED: Upgrade to @mapbox/node-pre-gyp fix various bugs with Node 12/14 [#5991](https://github.com/Project-OSRM/osrm-backend/pull/5991)
       - FIXED: `valid` type in documentation examples [#5990](https://github.com/Project-OSRM/osrm-backend/issues/5990)
+      - FIXED: Remove redundant loading of .osrm.cell_metrics [#6019](https://github.com/Project-OSRM/osrm-backend/issues/6019)
     - Profile:
       - FIXED: Add kerb barrier exception to default car profile. [#5999](https://github.com/Project-OSRM/osrm-backend/pull/5999)
 

src/storage/storage.cpp

@@ -489,15 +489,6 @@ void Storage::PopulateStaticData(const SharedDataIndex &index)
         partitioner::files::readCells(config.GetPath(".osrm.cells"), storage);
     }
 
-    if (boost::filesystem::exists(config.GetPath(".osrm.cell_metrics")))
-    {
-        auto exclude_metrics = make_cell_metric_view(index, "/mld/metrics/" + metric_name);
-        std::unordered_map<std::string, std::vector<customizer::CellMetricView>> metrics = {
-            {metric_name, std::move(exclude_metrics)},
-        };
-        customizer::files::readCellMetrics(config.GetPath(".osrm.cell_metrics"), metrics);
-    }
-
     // load maneuver overrides
     {
         auto views = make_maneuver_overrides_views(index, "/common/maneuver_overrides");