feat: uses form API to manage feedback submit submit button state (!15) · Merge requests · project / admin_feedback

set 'disabled' via the button's attributes array (NOTE: using the '#disabled' property on the element breaks '#ajax'),
uses '#states' property to enable/disable the button when the field is/is not filled/checked,
removes corresponding logic from js/admin_feedback.js
relocates cursor styling for disabled submit button to css from js

The message field has the same name whether it's a textarea or a set of radios, so we have to set the key of the states array to 'checked' or 'filled' dynamically.

Closes #3525479

feat: uses form API to manage feedback submit submit button state

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