staking/election: prolonged era and emergency mode for governance submission. (#8912)

* Implementation but weird initial era in tests

* Emergency mode for elections. (#8918)

* do some testing, some logging.

* some testing apparatus

* genesis election provider (#8970)

* genesis election provider

* fix historical stuff

* Fix test

* remove dbg

* Apply suggestions from code review

Co-authored-by: Zeke Mostov <32168567+emostov@users.noreply.github.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* capitalize comment and name without conflict

* fix log

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

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

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* apply suggestion on tests

* remove testing modifications

* Apply suggestions from code review

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Dmitry Kashitsyn <korvin@deeptown.org>

* apply suggestion

* fix master merge

Co-authored-by: kianenigma <kian@parity.io>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Zeke Mostov <32168567+emostov@users.noreply.github.com>
Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Dmitry Kashitsyn <korvin@deeptown.org>