DateTime: adding support to select preferred timezone for presentation of date and time values. (#23586)
* added moment timezone package.
* added a qnd way of selecting timezone.
* added a first draft to display how it can be used.
* fixed failing tests.
* made moment.local to be in utc when running tests.
* added tests to verify that the timeZone support works as expected.
* Fixed so we use the formatter in the graph context menu.
* changed so we will format d3 according to timeZone.
* changed from class base to function based for easier consumption.
* fixed so tests got green.
* renamed to make it shorter.
* fixed formatting in logRow.
* removed unused value.
* added time formatter to flot.
* fixed failing tests.
* changed so history will use the formatting with support for timezone.
* added todo.
* added so we append the correct abbrivation behind time.
* added time zone abbrevation in timepicker.
* adding timezone in rangeutil tool.
* will use timezone when formatting range.
* changed so we use new functions to format date so timezone is respected.
* wip - dashboard settings.
* changed so the time picker settings is in react.
* added force update.
* wip to get the react graph to work.
* fixed formatting and parsing on the timepicker.
* updated snap to be correct.
* fixed so we format values properly in time picker.
* make sure we pass timezone on all the proper places.
* fixed so we use correct timeZone in explore.
* fixed failing tests.
* fixed so we always parse from local to selected timezone.
* removed unused variable.
* reverted back.
* trying to fix issue with directive.
* fixed issue.
* fixed strict null errors.
* fixed so we still can select default.
* make sure we reads the time zone from getTimezone
