Support custom-elements that participate in forms

[nowells]

Right now react-router does not support component libraries that leverage custom-elements that implement the form participation api. This expands the guards checks to allow these form submit elements to function.

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[cliffordfajardo]

Right now react-router does not support component libraries that leverage custom-elements that implement the form participation api.

@nowells - curious as I'm learning, what component libraries have you used where you ran into this issue?

Future readers, found this doc on Form Participation API by google eng folks