GitHub Actions: Remove usage of CTest

It seems that new versions of CTest now require case-sensitive arguments,
resulting in an "unknown argument" error for "-vv", while documentation
shows the argument for the full verbosity option as "-VV".

In CMakeLists.txt, there is currently only 1 test registered to CMake
with add_test(), and that is to run the ninja_test binary.

Since using CTest is not reducing the number of commands used for testing,
fix the testing invocation by replacing CTest with a direct run of the test.

Signed-off-by: Michael Pratt <mcpratt@pm.me>

.github/workflows/macos.yml

@@ -24,9 +24,9 @@ jobs:
         cmake -Bbuild -GXcode '-DCMAKE_OSX_ARCHITECTURES=arm64;x86_64'
         cmake --build build --config Release
 
-    - name: Test ninja
-      run: ctest -C Release -vv
-      working-directory: build
+    - name: Test ninja (Release)
+      run: ./ninja_test
+      working-directory: build/Release
 
     - name: Create ninja archive
       shell: bash