Because

• cms smoke tests were failing on disable button styling
• Disabled styling now controlled with opacity (works for both solid colors and gradients

This pull request

• Update tests, add a check for disabled/enabled state + opacity change

Issue that this pull request solves

Closes: (issue number)

Checklist

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• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).

Screenshots (Optional)

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Other information (Optional)

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