IDisposable Pattern Cleanup and fix TestDictionary.TestResourceCleanup, #265 #670

Job	Run time
Test (windows-latest, net9.0, x64, Release)	3m 22s
Test (windows-latest, net8.0, x64, Release)	3m 19s
Test (windows-latest, net6.0, x64, Release)	3m 33s
Test (windows-latest, net48, x64, Release)	3m 53s
Test (windows-latest, net472, x64, Release)	3m 28s
Test (ubuntu-latest, net9.0, x64, Release)	1m 41s
Test (ubuntu-latest, net8.0, x64, Release)	1m 35s
Test (ubuntu-latest, net6.0, x64, Release)	1m 23s
	22m 14s

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