Remove Ocean testopencv test module

Summary:
Removes the Ocean `testopencv` test module and all of its references. This module provided OpenCV-based comparison tests for various Ocean CV components but is being deleted in its entirety.

Removed directories:
- `xplat/ocean/impl/ocean/test/testcv/testopencv` — the `testopencv` library and `testopencv_gtest_0..4` test targets (CMake targets `ocean_test_testcv_testopencv` and `ocean_test_testcv_testopencv_gtest`)
- `xplat/ocean/impl/application/ocean/test/cv/testcv/testopencv` — the `testopencv` application binary plus its Android/iOS variants (CMake target `application_ocean_test_cv_testcv_testopencv`)
- `xplat/ocean/res/application/ocean/test/cv/testcv/testopencv` — the Android/iOS resource targets consumed only by the application above
- `xplat/ocean/build/xcode/macos/ocean/test/testcv/testopencv` — the generated, now-orphaned Xcode project for the module (not referenced by the top-level `macos.xcworkspace`)

Updated references:
- Dropped `add_subdirectory(testopencv)` from `xplat/ocean/impl/ocean/test/testcv/CMakeLists.txt`
- Dropped `add_subdirectory(testopencv)` from `xplat/ocean/impl/application/ocean/test/cv/testcv/CMakeLists.txt`

The surviving `testcv` library and application targets did not depend on `testopencv`, and the only Buck consumer of the deleted library/resource targets was the deleted application BUCK file, so no other build targets reference the removed module.

Reviewed By: janherlingmeta

Differential Revision: D109898409

fbshipit-source-id: 6105bd88e927e3876c1af2975a378d8dd2d75a86

Author: enpe

build/xcode/macos/ocean/test/testcv/testopencv/testopencv.xcodeproj/project.pbxproj

@@ -7,7 +7,6 @@ cmake_minimum_required(VERSION 3.26)
 
 add_subdirectory(testadvanced)
 add_subdirectory(testdetector)
-add_subdirectory(testopencv)
 add_subdirectory(testsegmentation)
 add_subdirectory(testsynthesis)