Deallocate all the assigned memory in one go when MODFLOW finalizes #3777

Job	Run time
Check format	1m 10s
Build	7m 17s
Smoke test	12m 42s
Extended testing (ubuntu-22.04)	28m 58s
Test GNU fortran (macos-13, false)	48m 22s
Extended testing (macos-13)	56m 0s
Test Intel fortran (ubuntu-22.04)	38m 50s
Test GNU fortran (macos-14, false)	34m 24s
Extended testing (windows-2022)	50m 1s
Test Intel fortran (macos-13)	26m 56s
Test GNU fortran (macos-14, true)	1h 8m 34s
Test Intel fortran (windows-2022)	35m 15s
Test GNU fortran (ubuntu-22.04, false)	43m 37s
Test GNU fortran (ubuntu-22.04, true)	1h 43m 54s
Test GNU fortran (windows-2022, false)	49m 3s
	10h 5m 3s

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