Instead, a product selector has been added to the "Regenerate
product attributes lookup table" entry in the tools page. If a product
is selected, the tool regenerates the data only for that product;
otherwise, it regenerates the entire table.
This has forced a change on how the tools page is rendered. Now,
instead of each tool being just a description and a trigger link,
a form with GET method is rendered for each tool. The forms are rendered
first and then the tools, since HTML doesn't allow to include forms
inside tables; each button is associated to its form with a "form"
attribute.
Additionally, now the tools array returned by the woocommerce_debug_tools`
hook can have a 'selector' array with the details needed to render a
selector, which will also be part of the form for the tool.
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