fix(clang-tidy): performance fixes applied in tests and CI (#3051)

* Initial fixes

* Whoops

* Finish clang-tidy manual fixes

* Add two missing fixes

* Revert

* Update clang-tidy

* Try to fix unreachable code error

* Move nolint comment

* Apply missing fix

* Don't override clang-tidy config

* Does this fix clang-tidy?

* Make all clang-tidy errors visible

* Add comments about NOLINTs and remove a few

* Fix typo

tests/pybind11_cross_module_tests.cpp

@@ -104,6 +104,8 @@ PYBIND11_MODULE(pybind11_cross_module_tests, m) {
     m.def("return_self", [](LocalVec *v) { return v; });
     m.def("return_copy", [](const LocalVec &v) { return LocalVec(v); });
 
+    // Changing this broke things with pygrep. TODO fix
+    // NOLINTNEXTLINE
     class Dog : public pets::Pet { public: Dog(std::string name) : Pet(name) {}; };
     py::class_<pets::Pet>(m, "Pet", py::module_local())
         .def("name", &pets::Pet::name);
@@ -126,6 +128,7 @@ PYBIND11_MODULE(pybind11_cross_module_tests, m) {
     // test_missing_header_message
     // The main module already includes stl.h, but we need to test the error message
     // which appears when this header is missing.
+    // NOLINTNEXTLINE(performance-unnecessary-value-param)
     m.def("missing_header_arg", [](std::vector<float>) { });
     m.def("missing_header_return", []() { return std::vector<float>(); });
 }