Remove top-level structure from MPI source build workflow tar artifacts #1875

Job	Run time
Autotools Special Workflows / gcc DBG -Werror (build only)	4m 25s
Autotools Special Workflows / gcc no deprecated symbols (build only)	5m 12s
Autotools Special Workflows / gcc REL -Werror (build only)	5m 25s
Autotools Special Workflows / gcc DBG v1.10 default API (build only)	5m 25s
Autotools Special Workflows / gcc DBG v1.12 default API (build only)	5m 28s
Autotools Special Workflows / gcc DBG v1.14 default API (build only)	5m 7s
Autotools Special Workflows / gcc DBG v1.6 default API (build only)	5m 9s
Autotools Special Workflows / gcc DBG v1.8 default API (build only)	5m 16s
Autotools Parallel Special Workflows / gcc DBG parallel -Werror (build only)	4m 10s
Autotools Parallel Special Workflows / gcc REL parallel -Werror (build only)	4m 20s
Autotools Debug Workflows / GCC-debug-TS=disabled	13m 2s
Autotools Parallel Workflows / Parallel GCC-debug	4m 6s
Autotools Debug Thread-Safety Workflows / GCC-debug-TS=enabled	4m 35s
Autotools aocc Workflows / aocc production	17m 2s
Autotools Intel Workflows / linux-oneapi production	13m 29s
Autotools Julia Workflows / julia production	6m 0s
Autotools nvhpc Workflows / nvhpc production	18m 12s
Autotools Release Workflows / GCC-production-TS=disabled	12m 47s
Autotools Parallel Workflows / Parallel GCC-production	4m 54s
Autotools Release Thread-Safety Workflows / GCC-production-TS=enabled	4m 52s
Autotools TestExpress Workflows / Autotools production Express Test Workflows	12m 49s
Autotools TestExpress Workflows / Autotools debug Express Test Workflows	13m 23s
	2h 55m 8s

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