CLI: Don't suggest --exit-once-uploaded for local builds

[ghengeveld]

From AP-4298

The VTA sets exitOnceUploaded to false because it needs that for progress reporting. The CLI then suggests re-adding it:

ℹ Speed up Continuous Integration
Your project is linked to GitHub so Chromatic will report results there.
This means you can pass the --exit-once-uploaded flag to skip waiting for build results.

Local builds shouldn't get any such suggestions from the CLI.