* Rename DashboardPicker props

* Extend variable option pickers to allow providing custom onchage callback

* Update public/app/features/variables/pickers/OptionsPicker/actions.ts

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Update public/app/features/variables/pickers/OptionsPicker/actions.ts

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Update public/app/features/variables/pickers/OptionsPicker/actions.ts

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Update public/app/features/variables/textbox/TextBoxVariablePicker.tsx

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

* Codeformat

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>