* min collator check

* change statemint/mine min candidates

* Ci pass

* Update pallets/collator-selection/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Update pallets/collator-selection/src/lib.rs

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

* Apply suggestions from code review

* build fixes

* add error messages to errors

* added validator register check

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>