Add the option to convert a template part to regular blocks.

[Addison-Stavlo]

Description

Recently we added the ability to convert selected blocks into a Template Part (#20445), modeled after the reusable blocks flow:

Reusable blocks also has the option to convert back to regular blocks:

Similarly, we could the option to convert a single template part to regular blocks:

This PR enables this functionality. Is this something that makes sense for the Template Part flow? cc @mtias

How has this been tested?

Select a template part and try to convert it to standard blocks as shown in the screenshot above. Verify this works as expected.
Also verify the 'convert to template part' flow continues to work as expected.

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• 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.

[github-actions]

Size Change: +128 B (0%)

Total Size: 1.21 MB

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build/edit-site/index.js	22.1 kB	+128 B (0%)

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_{compressed-size-action}

[mtias]

I don't find the "Convert to regular blocks" phrasing super intuitive, especially for this case, since blocks within a template part are regular blocks. Perhaps something like "Detach blocks from template" or "Ungroup blocks from template" could make more sense.

[Addison-Stavlo]

Perhaps something like "Detach blocks from template" or "Ungroup blocks from template" could make more sense.

Im happy going with whatever naming makes sense. Updated to "Detach blocks from template part." for now.

I don't find the "Convert to regular blocks" phrasing super intuitive, especially for this case, since blocks within a template part are regular blocks.

Similarly, blocks within a reusable block are regular blocks? So the phrasing there may not be intuitive as well 🤔 .

[mattwiebe]

This works well in my testing. Code looks good, as far as I understand what's going on :)

[david-szabo97]

Tested with groups and all kinds of blocks and it all works well!

[Addison-Stavlo]

Note the failing template-part e2e is an unrelated problem with axe and is being addressed in #26535 or #26527