since we now run the test selection stage in the same container as the
build state, this is no longer necessary

also, do not only check the current project headers, as downstream
modules may want to test against changes in dumux

[md][box] Internal Dirichlet

See merge request !2637

* Set off-diagonal matrix blocks to zero if internal Dirichlet is set
* use correct problem() function in md framework

Use dumux_add_test

See merge request !2633

dumux_add_test makes additional checks and writes important files for the CI to work

[solver] Fix restartGMRes parameter number type

See merge request !2631

Revert "Merge branch 'fix/debug_sequential_2p_models_for_bcleverett_and_mcwhorter' into 'master'"

See merge request !2627

This reverts merge request !2608

Improve angeli test

See merge request !2607

Rewrite Install external with Python

Closes #866

See merge request !2252

Resolve "Update list of contributors"

Closes #1033

See merge request !2621

Python script translation for extractmodule

Closes #973

See merge request !2450

Fix/ci use correct skipped target

See merge request !2619

Feature/ci test selection parallel

See merge request !2605

[ci] Use exact regex match for test names in selection stage

See merge request !2618

Fix/run selected tests

See merge request !2615

Resolve "Two unreachable code sections"

Closes #1030

See merge request !2609