* Chore: adds query keys and refId reassignment on query row removal

* Chore: updates explore reducer tests to cover query row adding, removal, refId and key reassignment

* Chore: changes refId value in explore reducer from undefined to string to avoid introducing new strict null errors

* Chore: fixes a small nitpick with array spread in Explore reducer

* Chore: removes unnecessary dispatches in query row tests in Explore reducer test