Render poll end events in timeline (#10027)

* wip

* remove dupe

* use poll model relations in all cases

* update mpollbody tests to use poll instance

* update poll fetching login in pinned messages card

* add pinned polls to room polls state

* add spinner while relations are still loading

* handle no poll in end poll dialog

* strict errors

* render a poll body that errors for poll end events

* add fetching logic to pollend tile

* extract poll testing utilities

* test mpollend

* strict fix

* more strict fix

* strict fix for forwardref

* update poll test utils

* implicit anys

* tidy and add jsdoc

res/img/element-icons/room/composer/poll.svg

@@ -1,5 +1,5 @@
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