Accessibility: Add title attributes to buttons in block list entry and property editor UI

[manutdkid77]

Description

This PR restores tooltips on the Copy and Delete icons for Blocklist items in the Umbraco Backoffice #21841.

In earlier versions (v13), hovering over these icons displayed helpful tooltips. In v17, this functionality was missing. This change reintroduces the tooltips to improve editor usability and consistency.

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Steps to Test

1. Go to Umbraco Backoffice.
2. Open a page with a Blocklist.
3. Add Blocklist content.
4. Hover over the action icons (Copy, Delete) on the top right of the Blocklist item.
5. Confirm that tooltips are now visible when hovering.

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Screenshots

Recording.2026-02-20.175314.1.mp4

[github-actions]

Hi there @manutdkid77, thank you for this contribution! 👍

While we wait for one of the Core Collaborators team to have a look at your work, we wanted to let you know about that we have a checklist for some of the things we will consider during review:

• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
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• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[AndyButland]

Very nice @manutdkid77, thanks. I can see this working as expected.

[manutdkid77]

@AndyButland This PR adds tooltips for the Block List, not the Block Grid as reported in #20422.

Does the block-list-entry.element.ts file get referenced by Block Grid as well, meaning this fix would apply there too?

[AndyButland]

Ah, you're right. OK, I'll re-open this one and then look to associate it with the one you raised (and I closed as a duplicate).