[datalog] Translate unit tests to catch2 (#9002)

datalog/src/test/native/cpp/main.cpp

@@ -2,10 +2,8 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-#include <gtest/gtest.h>
+#include <catch2/catch_session.hpp>
 
 int main(int argc, char** argv) {
-  ::testing::InitGoogleTest(&argc, argv);
-  int ret = RUN_ALL_TESTS();
-  return ret;
+  return Catch::Session().run(argc, argv);
 }