MailKit CI/CD Pipeline

Added unit test for IMAP simulated PREVIEW for messages w/o a text body #927

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Run time

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Job	Run time
ci (windows-latest, Debug)	5m 42s
ci (windows-latest, Release)	4m 36s
ci (ubuntu-latest, Debug)	2m 44s
ci (ubuntu-latest, Release)	2m 36s
	15m 38s