Time-over-time comparison - Unit tests (#43653)

* Use createQueryWithClauses in createQueryWithCountAggregation

* Support column-specific aggregations in createQueryWithClauses

* Add tests for compare option presence

* Fix case

* Add a test for onAdd

* Split tests

* Rename tests

* Add boilerplate for CompareAggregations unit tests

* Fix assertion

* Add more tests

* Add offset input tests

* Add tests

* Update frontend/src/metabase/query_builder/components/CompareAggregations/CompareAggregations.unit.spec.tsx

* Update tests after merge

* Use constants instead of factory functions