Deallocate all the assigned memory in one go when MODFLOW finalizes #3783

Job	Run time
Build	10m 59s
Smoke test	14m 42s
Check format	1m 10s
Test GNU fortran (macos-13, false)	40m 6s
Test GNU fortran (macos-14, false)	34m 48s
Test Intel fortran (ubuntu-22.04)	40m 59s
Extended testing (ubuntu-22.04)	24m 2s
Test GNU fortran (macos-14, true)	1h 8m 33s
Test Intel fortran (macos-13)	25m 47s
Test GNU fortran (ubuntu-22.04, false)	44m 47s
Extended testing (macos-13)	48m 59s
Test Intel fortran (windows-2022)	34m 36s
Extended testing (windows-2022)	56m 3s
Test GNU fortran (ubuntu-22.04, true)	1h 37m 2s
Test GNU fortran (windows-2022, false)	45m 6s
	9h 47m 39s

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