AST-1495 Remove GSL dependency

.gitlab-ci.astron.yml

.gitlab-ci.common.yml

.gitlab-ci.ska.yml

.gitlab-ci.wheels.yml

CMakeLists.txt

docker/install_aoflagger.sh

docker/install_everybeam.sh

docker/install_fftw.sh

docker/install_hdf5.sh

docker/install_lua.sh

docker/make_wheels.sh

docker/py_wheel.docker

docker/ubuntu_20_04_base

docker/ubuntu_22_04_base

external/schaapcommon