Polls refinements (#1608)

* Refine focus behavior

* Begin draft mode

* Add alert on poll form

* Add poll ended asset

* Add fallback text for ended poll event

* Cleanup

* Fix assets

* Remove poll feature flags

* Fix UI tests

* Fix ui tests

* Refine discard poll alert

* Remove unused import

* Rename hasDraftContent -> hasContent

* Restore createPoll-2 ref screenshots

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