Make legacy multimap thread safe #642

Job	Run time
Compute matrix	3s
Doxygen check	38s
Verify Dev Containers / Verify devcontainers	10s
CUDA12.5 gcc / amd64 / Build gcc13/C++17 / Build gcc13/C++17	2m 47s
CUDA11.8 gcc / amd64 / Build gcc11/C++17 / Build gcc11/C++17	2m 39s
CUDA12.5 gcc / arm64 / Build gcc12/C++17 / Build gcc12/C++17	2m 54s
CUDA12.5 gcc / amd64 / Build gcc12/C++17 / Build gcc12/C++17	3m 6s
Verify Dev Containers / List devcontainers	4s
Verify Dev Containers / cuda12.5-gcc12	1m 9s
Verify Dev Containers / cuda12.4-gcc12	1m 0s
Verify Dev Containers / cuda12.5-gcc13	1m 2s
Verify Dev Containers / cuda12.5-gcc13	1m 10s
Verify Dev Containers / cuda11.8-gcc11	1m 15s
CUDA11.8 gcc / amd64 / Test gcc11/C++17 / Test gcc11/C++17	5m 48s
CUDA12.5 gcc / amd64 / Test ${{ inputs.test_name }}	0s
CUDA12.5 gcc / arm64 / Test ${{ inputs.test_name }}	0s
CUDA12.5 gcc / amd64 / Test gcc12/C++17 / Test gcc12/C++17	6m 6s
CI success	1s
	29m 52s

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