Octopus CLI 2.15.4

Enable updates of scoped common variables (#489)

* List scoped common variables

* Separate line per environment

* Fix default and sensitive value display

* Update naming for consistency with client

* Add shared feature toggle method

* Fix project var type

* Update the client version

* Handle errors in feature toggle function

* Create/update where values already exist for a template

* Handle creation where variables are missing for the provided scope

* Handle library variable creation where variables are missing for the provided scope

* Add tests for common and project variable updates

* Handle missing prompts for scoped tenant variables

* Include missing variables in prompt output

* Add tests for missing prompts

* Fix build error

* Remove values for missing values tests

* Create/update unscoped vars

* Display unscoped variables in list

* Handle variable creation for specific environment scoping when an unscoped variable exists

* Fix naming