DataViews: Fix focus loss when removing all filters or resetting

[ntsekouras]

What?

Fixes: #64697

In DataViews when we remove the last visible filter or resetting the filters the focus is lost.
This PR fixes that by focusing the add filter toggle when we do the above. I'm reusing the same Button for the filters toggle to have the same ref, because based on the visible filters we either render an add filter button or a toggle visibility of current filters one.

Testing Instructions

1. In any list using DataViews add some filters and then:
   1. remove all of the visible filters
   2. reset filters
2. Observe that in both cases the focus is not lost and is added back to the add filter button
3. You can try the above with keyboard navigation too.

[github-actions]

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Co-authored-by: ntsekouras <ntsekouras@git.wordpress.org>
Co-authored-by: ellatrix <ellatrix@git.wordpress.org>
Co-authored-by: jameskoster <jameskoster@git.wordpress.org>
Co-authored-by: oandregal <oandregal@git.wordpress.org>

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[github-actions]

Flaky tests detected in 3c4c6bd.
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/11837588090
📝 Reported issues:

• [Flaky Test] should close the inserter when clicking on the toggle button #48005 in /test/e2e/specs/editor/various/inserting-blocks.spec.js

[afercia]

I'm seeing that probably something has changed in the 'Patterns' list where, at least for me, the filters panel is initially open and thus focusing on useEffect sets initial focus on the FilterVisibilityToggle button. Will create a new issue.