Remove unnecessary usesContext from paragraph block

[SantosGuillamot]

What?

Remove unnecessary usesContext from paragraph block.

Why?

It doesn't seem to be used at all in the paragraph block.

If I am not mistaken, this was introduced as part of the first experiment of connecting blocks and custom fields: link. However, it was finally implemented using another solution, and it seems we didn't remove it.

How?

Just remove it from the block.json.

Testing Instructions

Tests should pass.

[github-actions]

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[github-actions]

Flaky tests detected in 03fc97a.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/8803311531
📝 Reported issues:

• [Flaky Test] aria-disabled is correctly hydrated for different values #54370 in /test/e2e/specs/interactivity/directive-bind.spec.ts

[gziolo]

Nice catch 👍