[3.13] gh-130077: Properly match full soft keywords in the parser (GH-135317) (#135399)

* [3.13] gh-130077: Properly match full soft keywords in the parser (GH-135317)
(cherry picked from commit ff2b5f40c2bf5c71255caac8a743c09ba0758c02)

Co-authored-by: Pablo Galindo Salgado <Pablogsal@gmail.com>

* Remove line the main-branch commit removed

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Co-authored-by: Petr Viktorin <encukou@gmail.com>