feat(card) add part: container to the outer container

[kiley-mitti]

Brief Description

Added a new part: container to run-card. This part is on the div with class 'rux-card'

JIRA Link

ASTRO-5893

Related Issue

General Notes

Motivation and Context

developers were previously unable to remove the box-shadow from card because it was placed on an element without a part. Now they can remove the box shadow if they wish.

Issues and Limitations

Types of changes

• [ ] Bug fix
• [x] New feature
• [ ] Breaking change

Checklist

• [ ] This PR adds or removes a Storybook story.
• [ ] I have added tests to cover my changes.
• [x] Regressions are passing and/or failures are documented
• [x] Changes have been checked in evergreen browsers

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 2afdf409b8b7c5ea2c3c66d8685f4eb51e7eaa5b

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

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