Add RuboCop::Cop::Primer::TestSelector to encourage use of the test_selector argument

[jdennes]

Description

This branch adds RuboCop::Cop::Primer::TestSelector, which aims to prevent people doing this:

Primer::BaseComponent.new(data: { "test-selector": "the-component" })

And instead encourage this:

Primer::BaseComponent.new(test_selector: "the-component")

Integration

Does this change require any updates to code in production?

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews

[changeset-bot]

🦋 Changeset detected

Latest commit: 5925849

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[camertron]

Nice, thanks! 🎉

[jonrohan]

I guess the changeset checker doesn't work well with forks. I'll admin merge this

[camertron]

@jonrohan oh man I didn't think about that 😬