Werk #15660: Temperature unit in graphs and perfometers is now user-configurable

The temperature unit used to render graphs and perfometers is now configurable on a per-user basis via the user profile. Users can either explicitly choose between degree Celsius and degree Fahrenheit or they can use the default temperature unit, which in turn is configurable via a global setting (linked in the user profile).

Note that this new setting does not affect the temperature unit used in service outputs (summary and details). Use the ruleset Temperature to configure this.

Finally, with this new feature, the option to configure unit conversions in graphs tunings is deprecated. This option was specifically introduced to make the temperature unit in graphs user-configurable, which is now possible via the setting introduced in this werk. Hence, unit conversions are no longer configurable via graph tunings and any already exisiting settings will be ignored.

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