Update App Launcher App Sharing based on new design (nebari-dev#249)

* Add app sharing component and add to app form.

* Update autocomplete with multi-select.

* Update table page styling.

* Update link sharing verbiage.

* Misc updates based on feedback.

* Fix build error.

* Misc refactoring. Add and update unit tests. Add new build.

* Fix test.

* Updates to fix error when no user share data in payload.

* Update to display app sharing section only if share info is included in payload.

* Misc styling fixes.

* Update to fix flakey tests.

* Removed commented code.