migrate Primer::BoxComponent to Primer::Box

[mxriverlynn]

split from #676

this PR renames Primer::BoxComponent to Primer::Box, adjusts all references to it, and adds a deprecated BoxComponent for backward compatibility. the component remains in stable status

additionally, a previous PR had a last minute change to use .to_sentence on an array of valid states. this method isn't available, so it's been changed back to a hard coded list for now.

files to note

there's a lot of files changed in this pr, but most of them are only reference changes. here are the important files to review:

• app/components/primer/box.rb
• app/components/primer/box_component.rb
• lib/primer/view_components/linters/helpers/deprecated_components_helpers.rb
• lib/rubocop/cop/primer/component_name_migration.rb
• stories/primer/box_component_stories.rb → stories/primer/box_stories.rb
• test/components/box_component_test.rb → test/components/box_test.rb
• test/components/component_test.rb

screenshots

storybook page for box:

doc site for box:

[changeset-bot]

🦋 Changeset detected

Latest commit: 735fccb

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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[jonrohan]

This looks good, I just want to make sure we space it out in releases between other renames like it so we don't have too many migrations at once in github/github.

Blocking so we don't accidentally add it to a release when we're not ready