31354/change structure for inputs

[jwgoedert]

Nested child elements in list items to create visual hierarchy, moved input fields to end of labels for screen reader usability
Trac ticket:
https://core.trac.wordpress.org/attachment/ticket/31354/

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Props jwgoedert, joedolson.

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[joedolson]

Some JS-related code left in.

[jwgoedert]

Removed leftover js code.

[joedolson]

in r59160