* 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