allow windows reserved names in CI (#15135)

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We are progressively moving the windows CI from windows 2022 to windows
2025 because we found windows 2025 more stable.

In rust-lang/rust#136478 a cargo test failed and
this might solve the issue. See
[this](rust-lang/rust#136478 (comment))
comment. What do you think?

If you have a better way of solving this, let me know 👍

Author: ehuss

crates/cargo-test-support/src/paths.rs

@@ -373,11 +373,6 @@ pub fn sysroot() -> String {
 pub fn windows_reserved_names_are_allowed() -> bool {
     use cargo_util::is_ci;
 
-    // Ensure tests still run in CI until we need to migrate.
-    if is_ci() {
-        return false;
-    }
-
     use std::ffi::OsStr;
     use std::os::windows::ffi::OsStrExt;
     use std::ptr;