Removed MipSolverInfo and last vestiges of MIP race #2453

Job	Run time
release_all_tests (macos-latest)	15m 24s
debug (macos-latest)	25m 13s
release (macos-latest)	8m 28s
debug_all_tests (macos-latest)	14m 6s
	1h 3m 11s

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