IDEA-124960 DevKit: "register extension" fix for EP defined in custom plugin
Platform: redefined shortcuts for bound actions work in inherited keymaps + such shortcuts is shown in the UI tree, in spite of being 'bound' (OC-9826)

Details:
when a bundled keymap is copied, the copy inherits the original one.
Consider we have a bound action A registered to use shortcuts of action B.
If any of the keymaps has custom shortcuts defined for action A, they should be used, regardless shortcuts of action B.

In addition, such actions should be shown in UI.
continue JS Debugger test framework