* ShareModal: refactor dashboard export modal

* Modal: show react modals with appEvents

* ShareModal: embed panel tab

* ShareModal: bind to shortcut (p s)

* grafana-ui: ClipboardButton component

* ShareModal: use ClipboardButton component

* ClipboardButton: add to storybook

* ShareModal: use event-based approach for dashboard share

* ShareModal: remove unused

* ModalReact: pass theme to the component

* ShareModal: styles clean up

* DashboardExporter: fix tests

* fixed whitespace betwen icon and link

* ShareModal: use theme from config

* Modal: tab header refactor

* ShareModal: tests

* ShareModal: fix share url rendering

* ShareModal: remove unused angular files

* Chore: fix strictNullChecks errors

* Modal: provide theme for event-based modal usage

* ShareModal: use ModalsController for opening modal

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>