Add VRT for accordion and breadcrumb skeleton

[tay1orjones]

Closes #9263
Closed #9264

Modifies the existing e2e tests to render skeletons so they're included in the snapshots diffed by percy.io

Changelog

Changed

• accordion: add skeleton to VRT
• breadcrumb: add skeleton to VRT

Testing / Reviewing

• Percy status check should fail and require approval of the new snapshot contents
• The Percy UI should should show the skeleton components
• Approve in the Percy UI if things look good

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