Remove always-on WildCardInForLoop language feature flag - #20221
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Fixes #20142
LanguageFeature.WildCardInForLoophas shipped since F# 4.7 and is enabled for every accepted--langversion(minimum 8.0), so the flag could never be turned off. Removed the dead flag and collapsed the guarded parse offor _ = … to …to its enabled behaviour.--disableLanguageFeature:WildCardInForLoopis no longer a recognised feature name.