moved testsolver to mra as an actual test case, #2221

Job	Run time
macos-latest: clang++ Release Threads	14m 29s
macos-latest: clang++ Release OneTBB	2m 23s
macos-latest: clang++ Release PaRSEC	4m 11s
ubuntu-24.04: /usr/bin/g++-13 Release Threads	34m 31s
ubuntu-24.04: /usr/bin/g++-13 Release OneTBB	2m 0s
ubuntu-24.04: /usr/bin/g++-13 Release PaRSEC	2m 45s
macos-latest: clang++ Debug Threads	29m 39s
macos-latest: clang++ Debug OneTBB	2m 0s
macos-latest: clang++ Debug PaRSEC	2m 30s
ubuntu-24.04: /usr/bin/g++-13 Debug Threads	1h 1m 31s
ubuntu-24.04: /usr/bin/g++-13 Debug OneTBB	1m 48s
ubuntu-24.04: /usr/bin/g++-13 Debug PaRSEC	1m 41s
	2h 39m 28s

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