Cxp 3055 separator icon fix omit props

[yasskin]

PR Checklist

Description of changes to SeparatorIcon:

• Add generic test for passThroughs
• Add unit test for passThroughs
• Convert story to functional story with type defs
• Replace omitProps and pick methods
• Update snapshot

Link(s) to Storybook on docspot: https://docspot.adnxs.net/projects/lucid/CXP-3055-SeparatorIcon-fix-omitProps/?path=/docs/visual-design-separatoricon--basic-separator-icon

• 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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