Create 2024-04-09-reduce-FP.md

Author: codeqlhelper

cpp/ql/src/change-notes/released/2024-04-09-reduce-FP.md

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+---
+category: majorAnalysis
+---
+* Reduce false positives of `GlobalUseBeforeInit.ql` and `InconsistentNullnessTesting.ql`.
+Many global variables that are initialized at declaration will be reported by `GlobalUseBeforeInit.ql`.
+When `checked` is in a macro expansion for handling exceptions, it is very likely for `InconsistentNullnessTesting.ql` to report false positives.