Twenty Twenty: "Add citation" text font-weight issue in Quote block

[shubhtoy]

In Twenty Twenty Theme, when italic formatting is applied to citation text in the Quote block's "Add citation" field, the editor and frontend display different font-weight styles. While the editor shows the italic text with normal font-weight, the frontend displays it with bolder font-weight, creating an inconsistency in the visual representation. The inconsistency also exist with bold font styles.

Steps to replicate:

1. Activate the Twenty Twenty Theme
2. Add Quote block
3. Add text in "Add citation" section
4. Select the added text and make it italic
5. Save Page/Post
6. View the page/post on frontend

Expected behavior: Editor should match frontend styling for italic citations

Solution: Added CSS rule to ensure italic citations display with bolder font-weight in the editor, matching the frontend appearance.

Trac ticket: #55934

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**This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more

[github-actions]

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[github-actions]

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