optional configurable retention period for schema checks

Currently, we store schema checks for the usage data retention period.

Since there are a lot of schema checks happening it will quickly eat up storage space.

We already optimized storage for duplicated SDL occurences via [https://github.com/kamilkisiela/graphql-hive/issues/2603](https://github.com/kamilkisiela/graphql-hive/issues/2603) (some SDLs were duplicated up to 2000 times).

We don't really need to store schema checks that long as the data is not relevant for such a long time.

Instead, we could default to a shorter time (similar to GitHub actions which is 2 weeks by default)
We could even allow increasing it in the UI for enterprise users if needed.