Convert ExecutionOptions::time_zone to Option #18081
Description
Is your feature request related to a problem or challenge?
We may want to update the doc for ExecutionOptions::time_zone slightly as well as currently it's very targetted at 'Extract'.
As a followup PR I think we could allow for when no tz is set in the config_options to use None vs Some('').
Originally posted by @Omega359 in #18017 (comment)
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