Deallocate all the assigned memory in one go when MODFLOW finalizes #3778

Job	Run time
Build	6m 39s
Check format	1m 12s
Smoke test	10m 41s
Test Intel fortran (ubuntu-22.04)	39m 6s
Extended testing (ubuntu-22.04)	22m 51s
Test GNU fortran (macos-13, false)	58m 25s
Test Intel fortran (macos-13)	37m 14s
Extended testing (macos-13)	1h 2m 35s
Test GNU fortran (macos-14, false)	32m 53s
Test Intel fortran (windows-2022)	33m 25s
Extended testing (windows-2022)	53m 17s
Test GNU fortran (macos-14, true)	1h 12m 38s
Test GNU fortran (ubuntu-22.04, false)	44m 20s
Test GNU fortran (ubuntu-22.04, true)	1h 40m 29s
Test GNU fortran (windows-2022, false)	47m 2s
	10h 22m 47s

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