Fix Attach Modal visibility

[Soare-Robert-Daniel]

Summary

Display the Attach Modal only on edit action of the Group Fields

Will affect visual aspect of the product

YES

Screenshots

New Group Fields

Existing Group Fields

Test instructions

• Attach modal should be visible on the page that creates the group fields
• It should be visible on the page that in which the group field is already created

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• I have written a test and included it in this PR
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Closes https://github.com/Codeinwp/ppom-pro/issues/497

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[selul]

@Soare-Robert-Daniel I don't think this is a solution to hide the feature for new group? Can't we do something that prevent confusion for new users ?

[Soare-Robert-Daniel]

@selul is not hiding since the old users did not have this possibility on that page (for products and tags, not categories)

If we want to be always available, we can create some shadow inputs in the fields form that synchronize with the modal and process it on the big save request. (similar to how it was working with the textarea for Categories in the old version)

[selul]

ok, we can keep it like this in this case. I don't have either better ideas.

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