refactor: Log level documentation on SolverBase and children #6886

Job	Run time
semantic_pull_request	2s
is_not_draft_pull_request	5s
baseline_log	7s
are_submodules_in_sync	8s
if_not_unassigned_pull_request	3s
code_coverage / build_test_deploy	1m 15s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	48s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	47s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	51s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	1m 3s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	41s
Check code style / build_test_deploy	43s
Check documentation / build_test_deploy	39s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	48s
Ubuntu CUDA (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	6s
Ubuntu CUDA debug (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	5s
run_integrated_tests	0s
check_that_all_jobs_succeeded	1s
	8m 12s

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