Cxp 2583 split vertical remove omit props

[yasskin]

PR Checklist

Description of changes for SplitVertical

• add unit tests for pass throughs
• replace omitProps with explicit list of omitted props
• clean up a few Storybook story syntax problems
• update the snapshot

Link(s) to Storybook on docspot:

• Manually tested across supported browsers

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

• [ ] Two cxp team engineer approvals

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

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

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