Block RTE: Add missing copy and delete buttons

[bohdansolovie]

Summary

Fixes missing copy and delete buttons for blocks in the richtext editor.

Description

Blocks inserted in the richtext editor were missing the copy to clipboard and delete buttons that are available in other block editors (like block-list). This PR restores this functionality by:

• Adding copy to clipboard functionality
• Adding delete button
• Following the same pattern used in block-list-entry for consistency

Testing

• Insert a block in the richtext editor
• Verify copy and delete buttons appear in the action bar
• Test copying a block to clipboard
• Test deleting a block

Fixes #21345

[github-actions]

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[bohdansolovie]

Hi, @AndyButland
can you check my updates and let me know what is needed more to update?

Thanks

[leekelleher]

@bohdansolovie Thank you for your pull request. I have reviewed the code, which does add the copy and delete actions to RTE block items. However it isn't quite feature complete, whilst the copy does add to the clipboard feature, it doesn't handle the pasting of block items back into the RTE itself. Similar with the delete, it does remove the block item from the RTE's blocks data structure, it doesn't clean-up the <umb-rte-block> tags in the markup HTML.

With the copying RTE blocks, I had already been developing this feature, (see PR #21604 for history), which handles the pasting of block items back into the RTE as well as compatibility with pasting between other block editors (Block Grid, Block List).

With the delete block item feature, this is also on my to-do list, I'm aiming to look at during this week.

I'll close off this PR, thank you for your efforts, it's appreciated. 🙏