test(kasan): re-enable kasan_test under build system v2

tools/test_apps/system/.build-test-rules.yml

@@ -115,9 +115,6 @@ tools/test_apps/system/init_array:
     - tools/tools.json
 
 tools/test_apps/system/kasan_test:
-  disable:
-    - if: IDF_BUILD_V2 == "1"
-      reason: 'KASAN is not yet supported under build system v2. TODO: IDF-15864'
   depends_components:
     - *common_components
     - esp_system

tools/test_apps/system/kasan_test/pytest_kasan.py

@@ -11,22 +11,10 @@ Two configurations:
              at a time via the Unity menu, expecting a panic.
 """
 
-import os
-
 import pytest
 from pytest_embedded import Dut
 from pytest_embedded_idf.utils import idf_parametrize
 
-# KASAN instrumentation is not yet emitted under build system v2, so the test
-# binary never reports a KASAN error and these cases would always fail. Skip the
-# whole module at collection time so no target_test job is even generated for it.
-# TODO: IDF-15864
-if os.environ.get('IDF_BUILD_V2') == '1':
-    pytest.skip(
-        'KASAN is not yet supported under build system v2. TODO: IDF-15864',
-        allow_module_level=True,
-    )
-
 # ---------------------------------------------------------------------------
 # no_halt configuration: all tests pass in one run
 # ---------------------------------------------------------------------------