Rust: Add Result::Err to excludeFieldTaintStep

Author: hvitved

rust/ql/lib/codeql/rust/frameworks/stdlib/core.model.yml

@@ -152,4 +152,5 @@ extensions:
       extensible: excludeFieldTaintStep
     data:
       - ["core::ops::range::RangeInclusive::start"]
-      - ["core::ops::range::RangeInclusive::end"]
+      - ["core::ops::range::RangeInclusive::end"]
+      - ["core::result::Result::Err(0)"]