[Form] Fix same choice loader with different choice values #46098
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It appears that deprecating the caching in the
LazyChoiceList
(cf #18359) was a mistake. The bug went under the radar because in practice every choice field has its own loader instance.However, optimizations made in #30994 then revealed the flaw (cf #42206) as the loaders were actually shared across many fields.
While working on a fix I ended up implementing something similar to what's proposed in #44655.
I'll send a PR for 5.4 as well.