## Summary
Utilizes constants package and deletes duplicate code
* Renames the `securitysolution-constants` to be `securitysolution-list-constants` to be specific
* Deletes duplicated code found during cleanup
* Moves more tests into the packages found along the way with the duplicated code
* Moves `parseScheduleDates` from `@kbn/securitysolution-io-ts-types` to `@kbn/securitysolution-io-ts-utils`
### Checklist
- [x] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios
