Adding --quiet mode

[jsnctl]

(implements #67)

• Adds --quiet opt to up command, which switches off the cursor animation
• Adds quiet bool to WatchProvisionStatus to conditional the spinner.Start() invocation per event. The quiet true case simply doesn't start the spinner
• Concretely sets down to false (these logs are less verbose, and we don't encounter cofidectl down as much in CI)
• single-trust-zone test now uses ./cofidectl up --quiet (perhaps a better place for this, a new test?)