ci(tools): Changed the approach of some build tests to cmake reconfigure

Where actually building the app is not needed cmake reconfigure was introduced instead.
This should be performance upgrade especially for Windows runners, where build is quite slow

tools/test_build_system/test_cmake.py

@@ -19,11 +19,10 @@ from test_build_system_helpers import run_cmake_and_build
 from test_build_system_helpers import run_idf_py
 
 
-# This test checks multiple targets in one test function. It would be better to have each target
-# tested in a isolated test case, but that would mean doing idf_copy each time, and copying takes most of the time
+# This test verifies ESP-IDF can be used as a library in custom CMake projects.
+# We use cmake configure only (not full build) and test representative targets from each arch.
 @pytest.mark.usefixtures('idf_copy')
 def test_build_custom_cmake_project(test_app_copy: Path, request: pytest.FixtureRequest) -> None:
-    # Test is compatible with any target. Random targets in the list are selected for performance reasons
     idf_path = Path(os.environ['IDF_PATH'])
     is_buildv2 = request.config.getoption('buildv2', False)
     if is_buildv2:
@@ -35,9 +34,11 @@ def test_build_custom_cmake_project(test_app_copy: Path, request: pytest.Fixture
         base_cmake_args = ['-G', 'Ninja']
         target_var = 'TARGET'
 
-    for target in ['esp32', 'esp32c2', 'esp32c3', 'esp32c6', 'esp32h2', 'esp32p4', 'esp32s2', 'esp32s3']:
-        logging.info(f'Test build ESP-IDF as a library to a custom CMake projects for {target}')
-        run_cmake_and_build(
+    # Test representative targets: Xtensa (esp32), RISC-V (esp32c3), and newest (esp32p4)
+    for target in ['esp32', 'esp32c3', 'esp32p4']:
+        logging.info(f'Test CMake configuration of ESP-IDF as a library for {target}')
+        # Use run_cmake (configure only) - compile_commands.json is generated during configure
+        run_cmake(
             str(idf_as_lib_path),
             *base_cmake_args,
             '-DCMAKE_TOOLCHAIN_FILE={}'.format(idf_path / 'tools' / 'cmake' / f'toolchain-{target}.cmake'),
@@ -45,9 +46,9 @@ def test_build_custom_cmake_project(test_app_copy: Path, request: pytest.Fixture
         )
         assert file_contains((test_app_copy / 'build' / 'compile_commands.json'), '"command"')
         shutil.rmtree(test_app_copy / 'build')
-        sdkconfig_path = idf_as_lib_path / 'sdkconfig'
-        if sdkconfig_path.exists():
-            os.remove(sdkconfig_path)
+        sdkconfig = idf_as_lib_path / 'sdkconfig'
+        if sdkconfig.exists():
+            sdkconfig.unlink()
 
 
 @pytest.mark.skipif(