fsc_flowCombobox: Add support for global variables

[DavinCasey]

Is your feature request related to a problem? Please describe. When using a scheduled flow, we have access to a global variable $Record.

Describe the solution you'd like It would be great if fsc_flowCombobox supported using this variable.

Describe alternatives you've considered Currently, we have to add a Get Record element where we search for the current record matching $Record.Id, we can then use the output of the record lookup in fsc_flowCombobox.

Additional context fsc_flowCombobox not showing global variables:

but they are supported in standard elements: