Add change note.

Author: lcartey

change_notes/2025-03-09-rule-8-7.md

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+ - `RULE-8-7` - `ShouldNotBeDefinedWithExternalLinkage.ql`:
+   - Remove false positives where the declation is not defined in the database.
+   - Remove false positives where the definition and reference are in different translation units.
+   - Remove false positives where the reference occurs in a header file.