[sridhar-git05]

Fix cv::cuda::absdiff for CV_32S when the subtraction result exceeds the signed 32-bit range.

The previous implementation performed the subtraction in int before taking the absolute value, causing overflow for cases involving INT_MIN.

The fix widens the subtraction to long long, computes the absolute difference safely, and saturates the result to INT_MAX.

Regression coverage is added for INT_MIN in both operand orders.

Fixes #4212.

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake