Add logs between fuchsia test steps. (#17584)
Add logs between fuchsia test steps. (#17584)

* Add logs between fuchsia test steps.

Adding logs and date time in between steps will simplify finding the
steps that are failing during the fuchsia tests.

https://github.com/flutter/flutter/issues/54253

* Use date command instead of DATE..

* Remove extra log line.

* Same spacer lenght for all the log lines.
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