Unit test for duplicate config target detection.

Closes #3401186

added 1 commit

• 2c2968de - Fix.

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added 7 commits

• 2c2968de...42194279 - 6 commits from branch project:11.x
• b3b7c9a6 - Merge branch '11.x' into 3401186-config_target-detect-duplicate

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