Block Editor: Migrate block-variation-picker to @wordpress/ui Text

[Sukhendu2002]

What?

Part of: #77265

Variation picker label — block-variation-picker/index.js uses . Migrate to Text.

[github-actions]

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[github-actions]

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[ciampo]

As mentioned in #77265 (comment), please update the PR description to include more details (especially around testing instructions) and a comprehensive before/after screenshots.