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