update project template

• fix(project-template): (re-)enable DOT support in Doxygen
• chore(project-template): remove obsolete pythonBindingHelperMacros
• feat(project-template): empty out enable_latest_cxx_support.cmake file
• feat(project-template): use clang-format-19 with "Latest" C++ standard

assigned to @martin.hierholzer

merged

mentioned in commit bdf148b3