Tests refactoring

add main test executable - and every test must be implemented in different functions.

Task 38: Tests refactoring - work plan (branch: task_38)

Create branch task_38 from main
Refactor tests/test_OpenSimplex2F.c: main() becomes the main test executable, every test is implemented in its own function (test_noise2, test_noise3, test_noise4)
Use the CTest framework: enable_testing() + add_test() per test (replaces the custom deployTest/test targets)
Update CMakeLists.txt and tests/CMakeLists.txt
Update CI workflow (the test target now runs ctest)
Build locally and run ctest - verify all tests pass
Push task_38, open PR, set label waiting-for-review

Create branch task_38 from main
Refactor tests/test_OpenSimplex2F.c: main() becomes the main test executable, every test is implemented in its own function (test_noise2, test_noise3, test_noise4)
Use the CTest framework: enable_testing() + add_test() per test (replaces the custom deployTest/test targets)
Update CMakeLists.txt and tests/CMakeLists.txt
Update CI workflow (the test target now runs ctest)
Build locally and run ctest - verify all tests pass (3/3 Passed, ctest -R single test verified, Makefile path verified)
Push task_38, open PR Tests refactoring: main test executable + CTest framework (issue 38) #39, set label waiting-for-review

PR: #39