Fix Performance/MapCompact cop (#24797)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/lib/admin/metrics/dimension.rb

@@ -14,9 +14,9 @@ class Admin::Metrics::Dimension
   }.freeze
 
   def self.retrieve(dimension_keys, start_at, end_at, limit, params)
-    Array(dimension_keys).map do |key|
+    Array(dimension_keys).filter_map do |key|
       klass = DIMENSIONS[key.to_sym]
       klass&.new(start_at, end_at, limit, klass.with_params? ? params.require(key.to_sym) : nil)
-    end.compact
+    end
   end
 end