Enable automatic exclusion of non-required dependencies in the Publishing Wizard

[alansemenov]

When Publishing Wizard opens, it automatically fetches all dependencies (both mandatory and non-mandatory) of the "main" content:

We will add an option to automatically exclude non-required dependencies by introducing a new app config property called publishingWizard.excludeDependencies. If this property is present and set to true in the app config, PubWiz should still fetch all dependencies, but then exclude all non-required dependencies before rendering the dependency list for enduser.

There should be no visible blinking (when we first show the full list, then remove dependencies). It should still be possible to manually include the automatically excluded dependencies, if needed.

In the case of the screenshot above, this is how it should look if the new config property is true:

Note that removal of non-mandatory dependencies and applying changes resulted in removal of the two dependencies that were originally required (because they were parents of the non-mandatory dependencies).