MailKit CI/CD Pipeline

Added some System.Diagnostics.Metrics telemetry for SmtpClient #986

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Run time

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Job	Run time
ci (windows-latest, Debug)	4m 56s
ci (windows-latest, Release)	3m 50s
ci (ubuntu-latest, Debug)	1m 35s
ci (ubuntu-latest, Release)	1m 29s
	11m 50s