Add test to ensure the BatBadBut mitigation handles trailing .
and space safely
#23363
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Previously: #19698
Context:
Note that the Rust test case for this checks that it executes the batch file successfully with the proper mitigation in place, while the Zig test case expects a FileNotFound error. This is because of a PATHEXT optimization that Zig does, and that Rust doesn't do because Rust doesn't do PATHEXT appending (it only appends .exe specifically, see #13993 (comment)). See the added comment for more details.