Add nagSuppressions to SonarCloud duplication exclusions

Author: kris-szlapa

sonar-project.properties

@@ -20,7 +20,8 @@ sonar.cpd.exclusions=**/*.test.*, \
     **/scripts/*, \
     **/jest.config.ts, \
     **/jest.debug.config.ts, \
-    eslint.config.mjs
+    eslint.config.mjs, \
+    packages/cdk/nagSuppressions.ts
 
 sonar.javascript.lcov.reportPaths=packages/cdk/coverage/lcov.info