[Feature] Database has time zone setting

[alexjustesen]

Description

This PR introduces a db_has_timezone setting that let's the application know the database is already reporting in the local time.

Testing

Configuration

• TZ environment variable was not passed to the application's container.
• Database had a TZ environment variable of America/New_York which matched the setting in the application's UI.
• Local time was set in the Time zone setting under the "General Settings" page.
• Database has time zone was enabled.

Results

• The scheduler still runs at the correct time, (i.e. 7:25 PM EST).
• The database returns 2023-12-12 19:25:xx for the 7:25 PM scheduled run.
• "Lastest result: ..." correctly displays the time difference
• Results table correctly displays 2023-12-12 19:25:xx
• Charts correctly display 2023-12-12 19:25:xx

Changelog

Added

• db_has_timezone to general settings

Changed

• changed the layout of the general settings page

Screenshots

Dashboard

Results Screenshot

General Settings page