Fix calls to realpath for shared network drives (#34132)

* Add try/catch around call to realpath in dummy_uuid

Author: corakingdon

base/loading.jl

@@ -117,7 +117,14 @@ end
 
 const ns_dummy_uuid = UUID("fe0723d6-3a44-4c41-8065-ee0f42c8ceab")
 
-dummy_uuid(project_file::String) = uuid5(ns_dummy_uuid, realpath(project_file))
+function dummy_uuid(project_file::String)
+    project_path = try
+        realpath(project_file)
+    catch
+        project_file
+    end
+    return uuid5(ns_dummy_uuid, project_path)
+end
 
 ## package path slugs: turning UUID + SHA1 into a pair of 4-byte "slugs" ##