refactor: cleanup setMGRStrategy a bit (#3422) #9341

Job	Run time
semantic_pull_request	1s
is_not_draft_pull_request	5s
are_submodules_in_sync	12s
baseline_log	12s
if_not_unassigned_pull_request	1s
code_coverage / build_test_deploy	55m 26s
Check documentation / build_test_deploy	1m 3s
Check code style / build_test_deploy	1m 18s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	6m 20s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	5m 49s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	5m 19s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	6m 24s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	5m 21s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	12m 30s
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	10m 39s
Rockylinux CUDA (8, clang 17.0.6, cuda 12.5.1) / build_test_deploy	14m 58s
Rockylinux CUDA (8, gcc 8.5, cuda 12.5.1) / build_test_deploy	10m 31s
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	4m 38s
Ubuntu CUDA (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	10m 46s
run_integrated_tests / build_test_deploy	36m 55s
check_that_all_jobs_succeeded	1s
	3h 8m 29s

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