HF RL Explorer

Replace total ordering usage with comparison functions implementation

Replace total ordering usage with comparison functions implementation: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). https://github.com/wagtail/wagtail/blob/cd5200c8e1ac0d7299fd9c398b2b994606b3c7d2/wagtail/admin/search.py L12-L13

The task

https://github.com/wagtail/wagtail/blob/cd5200c8e1ac0d7299fd9c398b2b994606b3c7d2/wagtail/admin/search.py#L12-L13

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.