Collective: Benchmark with greater `MaxProposals` (#12454)

* Collective: Benchmark with greated

* fix

* remove bs

* id_to_remark_data

* fix

* remove hardcoded

* clean up

* simplify

* questionable renaming

* better variable name

* better solution

* no need for large length

* better solution

* Update frame/collective/src/benchmarking.rs

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

* fix

* test

* remove test

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>