Rework accuracy test for legacy C-API cvApproxPoly and CV_PerimeterTest - #29547
### Pull Request Readiness Checklist
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- [x] I agree to contribute to the project under Apache 2 License.
- [x] 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
- [x] The PR is proposed to the proper branch
- [x] 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
**Details:**
This PR restores the deleted C-API `cvApproxPoly` tests (part of #24957).
I used `cv::pointPolygonTest` to make sure every original point is within the allowed `epsilon` distance to the final approximated polygon rather than calculate the distance to the corresponding line.
**Update:**
Restored `CV_PerimeterTest` *TEST(Imgproc_ContourPerimeter, accuracy)*.
Created a parameterized test for open/closed curves with int/float type shapes. I also added a simple 10x10 square test.
Alessio Roberto Antochi
Alexander Smorkalov