Add environment settings for .NET CLI

Add environment variables to skip first time experience and telemetry.

Version 6.1.0 - NET10 (#204)

Version 6.0.3 (#200)

Version 6.0.2 (#195)

Version 6.0 (#194)

Version 5.2.4 (#192)

Version 5.2.3 (#182)

Version 5.2.1 (#149)

Version 5.2.0 (#142)

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