Add "Submit To All" button on the Offer File sharing screen in GUI

[OverActiveBladderSystem]

I imagine some users would want to share any offer file they create to every site possible for listing.

Rather than select one by one, a "submit to all" button allowing them one-click submission to all the sites.

[BrandtH22]

@OverActiveBladderSystem , note I transferred this enhancement request to the GUI repo for better visibility 👍