Reduce verbosity of worker logs

[isobelormiston]

The existing logging for a successful action looks like this:
“Received task..”
“Executing action..”
“Prepared directory for..”
“Completed execution for..”
“Uploaded outputs for..”
“Uploaded action result for..”

This reduces it to just “Executing action..”

[Hamishpk]

Should we change the other happy path notice logs to debug and ensure all error logs are up to date?

For example we don't need to know a worker uploaded all outputs but we do need to know if it failed to upload outputs.

[isobelormiston]

This now logs only "Executing action ....", and the errors include the action hash so we can follow an action's journey.