Add better tests for GraphQL filtering and lookup

[arthanson]

Proposed Changes

The GraphQL tests currently test all model fields, but are very light on testing any filtering of objects or sub-objects. We should add tests for checking different primary filters:

{
  site_list(filters: {name: {i_contains:"DM"}}) {
    id
    name
  }
}

and sub-object filtering:

{
  site_list {
    id
    name
    tags(filters: {name: {i_starts_with: "P"}}) {
      name
    }
  }
}

Justification

The filtering logic for Strawberry is undergoing some major refactors and we could easily miss issues with filtering without tests in-place.

[github-actions]

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[loulecrivain]

Heya, just a heads up from a Netbox-using organization regarding this proposed change.

I've seen and experienced some issues/regressions regarding GraphQL filters following latest release and refactors.
Now I know GraphQL isn't used much internally in Netbox itself. However for lots of people writing exporters, crawlers, you name it, GraphQL API is actually the go-to.

In my opinion, if we want to be on par with the level of quality of the REST API, ensuring filters are working as expected should be a priority. +1 for automated testing here

[jeremystretch]

@loulecrivain thanks for your interest. Would you be willing to volunteer to contribute this work?