Enhancement: Add TinyMCE editor for user biography

[AKSHAT2802]

Trac ticket: https://core.trac.wordpress.org/ticket/64349

[github-actions]

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[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Props akshat2802, westonruter.

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[westonruter]

See comment.