fix: exclude src/__tests__ from sonar.sources to avoid duplicate indexing

AI-Session-Id: 7cc4f2fa-2bef-4add-b7a7-abe2b510985e
AI-Tool: claude-code
AI-Model: unknown

Author: sanzmauro

.harness/pipeline.yaml

@@ -107,7 +107,7 @@ pipeline:
                         -Dsonar.tests=src/__tests__ \
                         -Dsonar.host.url=https://sonar.harness.io \
                         -Dsonar.token=<+secrets.getValue("sonarqube-token")> \
-                        -Dsonar.exclusions="**/node_modules/**,**/umd/**,**/es/**,**/lib/**"
+                        -Dsonar.exclusions="**/node_modules/**,**/umd/**,**/es/**,**/lib/**,src/__tests__/**"
               - step:
                   type: Run
                   name: Post Quality Gate