* [VAULT-33083] support mount external engine
* add "Plugin type" and "Plugin version" fields to the enable mount page
* add changelog
* address copilot review comments
* address PR comments, code cleanup
* fix test failures
* Add support for external plugins registered without a plugin version
* external plugin should be enabled for enterprise only, plugin version should be mandatory for external plugins
* fix tests
* address copilot feedback
* fix failing tests, add unit test coverage
* address PR comments
* address PR comments
* remove dead code
* move no external versions alert
* Only show un-versioned plugin message if there are un-versioned plugins in the catalog.
* address PR comments
* use ApiService instead of custom PluginPinsService; fix failing tests
* revert changes to forms/mount.ts and forms/auth/method.ts
Co-authored-by: Shannon Roberts (Beagin) <beagins@users.noreply.github.com>
