- Adds an "End Poll" item in the action list long press menu. - Shows only on remote polls that have not ended yet and only if the user is the creator or has redact powers. Closes https://github.com/vector-im/element-meta/issues/2026
NB: This is missing analytics, which will be added once https://github.com/matrix-org/matrix-analytics-events/pull/85 is merged. Closes https://github.com/vector-im/element-meta/issues/2011
