add missing events to elections fallback (#11436)

* add missing events to elections fallback

* Update frame/election-provider-multi-phase/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Update frame/election-provider-multi-phase/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* add test

* fix

* fmt

* Update frame/support/src/storage/types/nmap.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>