[#3930] Fix cppcheck after adoption of meson

[#3930] Fix cppcheck after adoption of meson

- Was running on build dir which had little to no sources.
- Use the compile_commands.json file provided by meson which enables
  cppcheck to know about compiler flags used in compilation.
- Make the cppcheck target write to cppcheck-result.xml which is
  expected in the cppcheck-htmlreport target.
- Add library=googletest so it correctly decodes gtest macros.
- Remove suppression list. A lot of the suppressions were fixed with
  proper use of cppcheck or are no longer reported.