Disable Autocomplete on User Input form field

[relandboyle]

Related User Story
Depending on the user's browser and settings, autocomplete suggestions may appear when interacting with the User Input text field.
This behavior is undesirable in this context because our app does not provide styles for the suggestions, and we don't control the content.
Disable autocomplete suggestions on this field.

https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/autocomplete

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