Cxp 2583 split vertical fix prop types passthroughs

[yasskin]

PR Checklist

Description of changes:

• Add unit tests for pass throughs and propTypes
• Update Stories with SB6 controls and make them functional
• Replace omitProps with explicit list of props

Link(s) to Storybook on docspot: https://docspot.adnxs.net/projects/lucid/CXP-2583-SplitVertical-fix-propTypes-passthroughs/?path=/docs/private-splitvertical--default-split

• Manually tested across supported browsers

  • [x] Chrome
  • [ ] Firefox
  • [ ] Safari

• [ ] Two cxp team engineer approvals

• [ ] One product design approval (as necessary)

• [x] Unit tests written (common at minimum)

• [x] PR has one of the semver- labels

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