add support for cloned plugins in deck

[Prashansa-K]

Endpoint: /cloned-plugins

More details: https://kongstrong.slack.com/archives/C04349E4KRC/p1779349109682309

[ajessup]

Also note, that since cloned plugins and custom plugin definitions may be included in a deck config but the user applying the config may not have permission to apply those definitions (even if they can create instances of the plugins) it would be helpful to add a flag that skips applying those definitions.

More detail here: https://kongstrong.slack.com/archives/C0A1JBUT7A9/p1779350252969389