fix(SfSelect): disabled state attributes [SFUI2-1307]

[jagoral]

Related issue

https://vsf.atlassian.net/browse/SFUI2-1307

Scope of work

Removed redundant selected attribute from SfSelect placeholder. It caused a warning: Warning: Use the defaultValue or value props on <select> instead of setting selected on <option>

Screenshots of visual changes

Checklist

• Self code-reviewed
• Changes documented
• Semantic HTML
• SSR-friendly
• Caching friendly
• a11y for WCAG 2.0 AA
• examples created
• blocks created
• cypress tests created

[changeset-bot]

🦋 Changeset detected

Latest commit: 7d851e9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@storefront-ui/react	Patch
@storefront-ui/vue	Patch
@storefront-ui/nuxt	Patch

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[Szymon-dziewonski]

Hey @jagoral thanks for contribution, however tests are failing so they need to be adjusted https://github.com/vuestorefront/storefront-ui/blob/e0b7224b1cb1bb51e65feb0e4ed5a03e8128c048/packages/tests/components/SfSelect/SfSelect.cy.tsx in line 102 change it into page().isNotDisabled().hasSelectedOption('blue'); should do the work :). Please let me know if you'll have any questions :)

[sonarcloud]

[storefront-ui-vue] Kudos, SonarCloud Quality Gate passed!   

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[sonarcloud]

[storefront-ui-vue] Kudos, SonarCloud Quality Gate passed!   

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[sonarcloud]

[storefront-ui-react] Kudos, SonarCloud Quality Gate passed!   

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[jagoral]

@Szymon-dziewonski test fixed, thanks