Ant Design 5: Upgrade Alert component

[geido]

Please refer to SIP-139 https://github.com/apache/superset/issues/29268.

The Alert component should be upgraded to Ant Design version 5.

Similar work has been completed here.

When upgrading the component to Ant Design 5, please ensure to include:

• Proper RTL test coverage if not present yet.
• A Storybook file (if not present) or all necessary changes.
• Include all relevant component options in the Storybook.
• Clean up unnecessary custom styles.

When opening a PR:

• Name your PR refactor({Component}): Upgrade {component} to Ant Design 5
• Add screenshots of BEFORE/AFTER in your PR.
• Update the project tracker when your PR is merged.
• Make sure you or a committer has labeled your PR with frontend:refactor:antd5.

[geido]

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[LevisNgigi]

Hey @geido I would love to work on this

[fardin-developer]

Hey I am working on this issue, please assign me.