Add test_class_sh_property_stl to CMakeLists.txt (google#30017)

* Add test_class_sh_property_stl to CMakeLists.txt (fixes oversight in PR google#30012)

* clang-tidy auto fixes

Author: rwgk

tests/CMakeLists.txt

@@ -130,6 +130,7 @@ set(PYBIND11_TEST_FILES
     test_class_sh_mi_thunks
     test_class_sh_module_local.py
     test_class_sh_property
+    test_class_sh_property_stl
     test_class_sh_shared_ptr_copy_move
     test_class_sh_trampoline_basic
     test_class_sh_trampoline_self_life_support

tests/test_class_sh_property_stl.cpp

@@ -8,12 +8,12 @@
 namespace test_class_sh_property_stl {
 
 struct Field {
-    Field(int wrapped_int) : wrapped_int{wrapped_int} {}
+    explicit Field(int wrapped_int) : wrapped_int{wrapped_int} {}
     int wrapped_int = 100;
 };
 
 struct FieldHolder {
-    FieldHolder(const Field &fld) : fld{fld} {}
+    explicit FieldHolder(const Field &fld) : fld{fld} {}
     Field fld = Field{200};
 };