Cleanup/Code coverage update.

[kidunot89]

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What does this implement/fix? Explain your changes.

Some cleanup. Adds more tests and removes some unnecessary types.

Progress checklist

Connection Tests

• Product to Term
• Term to Product
• Product to MediaItem

Modelless WPObjectType Test

• CustomerAddress - Already tested in Feature/register customer mutation #55
• ProductAttribute - Test created in ProductAttribute completion #50
• ProductDownload

Types Removed

• ProductRatingCount

Code coverage increased

• Product
• ProductVariation

Does this close any currently open issues?

#46

Any relevant logs, error output, GraphiQL screenshots, etc?

(If it’s long, please paste to https://ghostbin.com/ and insert the link here.)

Any other comments?

…

Where has this been tested?

Operating System: Ubuntu 18.04

WordPress Version: 5.2