Block Inserter: Prevent page scroll when searching a block

[walbo]

Description

Prevent page scroll when searching in the block inserter.

Fixes #33011

Types of changes

Bug fix

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[github-actions]

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[Mamaduka]

Thanks for working on this, @walbo.

Unfortunately, I'm still able to reproduce the issue after applying a fix from your branch.

[walbo]

Thanks @Mamaduka

The issue is with the use of VisuallyHidden inside the sidebar. I didn't see that it was also used in the downloadable blocks card at the bottom.

Have updated the PR and moved the position relative to the content div so it should now handle all use of VisuallyHidden in the sidebar.

[Mamaduka]

The latest update fixes the issue.

Thanks again for working on this, and congrats on your first GB PR 🎉

P.S. I will merge this once all checks are green.

[walbo]

Rebased the branch to hopefully make the CI pass

[Mamaduka]

Thanks again for working on this PR, @walbo.