Stabilize feature `result_flattening`#141072

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Rynibami wants to merge 3 commits intorust-lang:masterfrom

Rynibami:stabilize-const-result-flatten

Commits on May 16, 2025

Updated feature and stable flags
Ryan van Polen
committed
Removed feature flag from `compiler/rustc_driver_impl`
Ryan van Polen
committed
Updated feature flag and output of `clippy/tests/ui/map_flatten*`
Ryan van Polen
committed