Summary:
Original diff: https://phorge.dev.yugabyte.com/D43770 (a21d4ee4565bec4304adc04d92d9258b1a8ff372)

This sets time zone for the java process. For postgres, it is already set in the config file /opt/yugabyte/software/active/pgsql/conf/postgresql.conf as
timezone = 'UTC'. Verified it by

```
[root@ip-10-9-89-26 bin]# ./psql -U postgres -d yugaware -h localhost
psql (14.17)
Type "help" for help.

yugaware=# show timezone;
 TimeZone
----------
 UTC
(1 row)
```

Test Plan: Verified by setting it my local YBA.

Reviewers: amalyshev, nbhatia, muthu

Reviewed By: muthu

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D43864