`<flat_map>` `<flat_set>`: Add `_NODISCARD`, remove nested `_Clear_guard`, add precondition checks etc. - #5953

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Stephan T. Lavavej (StephanTLavavej) merged 26 commits into

microsoft:feature/flat_mapfrom

vmichal:flat-map-nodiscard

Dec 12, 2025

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