refactor: move navigation plugin into npm

[kieckhafer]

Resolves #6127

This PR removes the internal navigation plugin, and installs the new plugin-navigation as a replacement.

The code in that npm plugin is the same, so the expected outcome of this PR is seeing nothing different than how the app currently runs.

Running this query will show you the defaultNavigationTreeId, which has moved into the new package. If this query works, you should be good to go:

{
  primaryShop {
    defaultNavigationTreeId
  }
}

[willopez]

LGTM

[kieckhafer]

@aldeed this works, just wondering if this is how we want to import simpleSchemas from outside packages, or if there was something else in mind?

[aldeed]

@kieckhafer This would be fine. I had kind of hoped that when we got to this we'd start moving the integration tests out of this repo and into their respective package repos, but we have some work to do yet before that can happen.

[kieckhafer]

@aldeed does the failing GraphQL issue mean we need to move that part of the schema into the navigation plugin itself, or is there another way for that to work?

[aldeed]

@kieckhafer Yes I think the correct solution in this case is to cut the following out of the shop schema file, and add it to the nav package schema file within extend type Shop { }.

"The default navigation tree for this shop"
  defaultNavigationTree(
    "Navigation tree language"
    language: String!,

    "Whether to include secondary navigation items"
    shouldIncludeSecondary: Boolean = false
  ): NavigationTree

  "The ID of the shop's default navigation tree"
  defaultNavigationTreeId: String

[aldeed]

And move all related resolvers into that plugin package, too.

[willopez]

confirmed it still works

[kieckhafer]

@spencern this is good to go, outside of the snyk issue. Once you figure out the deal there, can you please re-run snyk and merge this if it's good (or ping me and I can do it)

[spencern]

Override approval of license failure.

[spencern]

This is the plugin that is getting flagged by snyk's license check as GPLv3. We've kept the GPLv3 license that this code was originally licensed under after migrating it to it's own package. We'll need to merge this code anyway and then add an ignore to snyk for this particular package.