replace disabled styling with just opacity

[niteshxandr]

st opacity OE-1421

PR Checklist

Description of changes:

Link(s) to Storybook on docspot:

• Manually tested across supported browsers

  • [X] Chrome
  • [ ] Firefox
  • [ ] Safari

• [ ] Two cxp team engineer approvals

• [ ] One product design approval (as necessary)

• [ ] Unit tests written (common at minimum)

• [ ] PR has one of the semver- labels

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