Revert "python: Move catch_conflicts.py into subdirectory (#23600)" (#24528)

This reverts commit 76213d102c1eaa91e733b326d9d312b60103d88a.

pkgs/development/interpreters/python/catch_conflicts/README.md

···
-
-
-catch_conflicts.py
-==================
-
-The file catch_conflicts.py is in a subdirectory because, if it isn't, the
-/nix/store/ directory is added to sys.path causing a delay when building.
-
-Pointers:
-
-- https://docs.python.org/3/library/sys.html#sys.path
-
-- https://github.com/NixOS/nixpkgs/pull/23600

pkgs/development/interpreters/python/mk-python-derivation.nix

···
   postFixup = ''
     wrapPythonPrograms
   '' + lib.optionalString catchConflicts ''
-    # Check if we have two packages with the same name in the closure and fail.
-    # If this happens, something went wrong with the dependencies specs.
-    # Intentionally kept in a subdirectory, see catch_conflicts/README.md.
-    ${python.interpreter} ${./catch_conflicts}/catch_conflicts.py
+    # check if we have two packages with the same name in closure and fail
+    # this shouldn't happen, something went wrong with dependencies specs
+    ${python.interpreter} ${./catch_conflicts.py}
   '' + attrs.postFixup or '''';
 
   passthru = {
···
     isBuildPythonPackage = python.meta.platforms;
   };
 })
+
+