Fix lg-alert role attibute not being read by VoiceOver

[eduardh-landg]

Description

Currently, the variant setter code is unable to read the role input and automatically sets one. Subsequently, the role is read afterward and adjusted accordingly. Consequently, VoiceOver will behave according to the role set by the variant setter code, despite the role being changed immediately afterward.

Checklist:

• The commit messages follow the convention for this project
• I have provided an adequate amount of test coverage
• I have added the functionality to the test app
• I have provided a story in storybook to document the changes
• I have added the documentation
• I have added any new public feature modules to public-api.ts

[eduardh-landg]

I won't be able to follow up on this discussion up until the 6'th of May but you can seek the wise counsel of Mr. @markblandford.

[github-actions]

🎉 This PR is included in version 11.13.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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