Draft: Feature/cppcheck parallel

What this MR does / why does DuMux need it:

After upgrading cppcheck from 2.9.x to 2.12.x, cppcheck takes much longer (apparently it used to abort checking for most targets). The most expensive check, using --project=build-cmake/compile-commands.json, does not parallelize, so this MR distributes the work using GNU parallel.

In addition we compile a more optimized build of cppcheck (dumux-docker-ci!39).

To make cppcheck even faster for MR pipelines, consider

• using MR test selection to filter also compile commands
• not loading DUNE includes for MR, possibly replacing them by a .cfg file

Notes for the reviewer

Requires dumux-docker-ci!39

Before you request a review from someone, make sure to revise the following points:

• does the new code follow the style guide?
• do the test pipelines pass? (see guide on how to run pipelines for a merge request)
• is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
• does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in CHANGELOG.md.
• is the list of the header includes complete? ("include what you use")
• all files have to end with a \n character. Make sure there is no \ No newline at end of file comment in "Changes" of this MR.