fix(clang-tidy): Enable clang-tidy else-after-return and redundant void checks (#3080)

* Enable clang-tidy else-after-return and redundant void checks

* Fix remaining else-after

* Address reviewer comments

* Fix indentation

* Rerun clang-tidy post merge

tests/test_virtual_functions.cpp

@@ -112,7 +112,9 @@ public:
     void operator=(const NonCopyable &) = delete;
     void operator=(NonCopyable &&) = delete;
     std::string get_value() const {
-        if (value) return std::to_string(*value); else return "(null)";
+        if (value)
+            return std::to_string(*value);
+        return "(null)";
     }
     ~NonCopyable() { print_destroyed(this); }