Change the time zone in spdlog messages to UTC

[markccchiang]

Closes #1151. Changing the time zone in spdlog messages from local to UTC.

[kswang1029]

@pford thank you for studying the timestamp format in casacore. 👍

[markccchiang]

@kswang1029 Should we also apply this setting in the log file and performance log?

[kswang1029]

yes everything displayed in the console and carta.log should be consistent in UTC.

[ajm-ska]

I was just about to ask about the log file. I thought I had checked out the wrong branch or that it wasn't working.

[kswang1029]

I see casacore log is missing in carta.log. It is seen on console. 🤔

[ajm-ska]

I see casacore log is missing in carta.log. It is seen on console. 🤔

@kswang1029 I notice that too. Could it be that the casacore log was never written to ~/.carta/log/carta.log when running a local version of CARTA, as I can't seem to find any casacore log entries from before?
I only see casacore log entries in the carta-controller log files in /var/log/carta/.