MailKit CI/CD Pipeline

Add test coverage for the \Marked and \Unmarked folder attributes #923

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Run time

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Job	Run time
ci (windows-latest, Debug)	4m 31s
ci (windows-latest, Release)	3m 33s
ci (ubuntu-latest, Debug)	2m 56s
ci (ubuntu-latest, Release)	2m 32s
	13m 32s