Before T275588: Pressing enter on site list field removes the current field hitting enter anywhere in the form would trigger the first button, which would remove the first site row, as part of implicit form submission.
As a partial fix, we added a fake button that is disabled and hidden and goes first, so that that button is triggered instead. Hitting enter from within the entry row textboxes no longer triggers the removal of the first site row.
However, at the time I couldn't figure out why this didn't fix it for hitting enter elsewhere in the form, which still triggers that removal. Users are less likely to hit enter outside of the textbox, so it isn't as big of a deal, but it should still be address

Acceptance criteria:
Hitting enter anywhere in the form (other than when a specific button is in focus) does not trigger anything, including the removal of the first site row