refactor: clean up kernel flags usage in flow solver to avoid bugs #9446

Job	Run time
semantic_pull_request	2s
is_not_draft_pull_request	10s
baseline_log	4s
are_submodules_in_sync	13s
if_not_unassigned_pull_request	3s
code_coverage / build_test_deploy	2s
Check code style / build_test_deploy	1m 18s
Check documentation / build_test_deploy	1m 1s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	8m 14s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	8m 38s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	7m 30s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	8m 23s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	8m 1s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	13m 25s
Pangea 3 CUDA (AlmaLinux 8.8, gcc 9.4.0, open-mpi 4.1.2, cuda 11.5.0, openblas 0.3.10) / build_test_deploy	6s
Rockylinux CUDA (8, clang 17.0.6, cuda 12.5.1) / build_test_deploy	6s
Rockylinux CUDA (8, gcc 8.5, cuda 12.5.1) / build_test_deploy	5s
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
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
run_integrated_tests / build_test_deploy	36m 22s
check_that_all_jobs_succeeded	1s
	1h 33m 55s

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