Compile list of business identifiers from CPRD extract to use for baseline testing

Although we will be testing the tombstone and backfill data migration pipelines against the full CPRD dataset before doing the actual prod migration, for efficiency purposes we will compile a list of business identifiers to use as a quick baseline check of the pipelines at a given point in time.

Note: take into consideration list of identifiers David R already provided.

The business identifers selected should in aggregate cover the following criteria:
* businesses with a lot of filings
* all filing types are covered
* businesses that have very complex filing history
* businesses that involve complex party data and history

**TODOs**
- [ ] Compile list of identifiers broken down according to critiera specified in description. Use CPRD extract for this work

Start with the CPRD extract and the list of identifiers previously provided by David R. Compile identifiers grouped by filing volume, filing-type coverage, filing-history complexity, and complex party data or history. Done means the list covers every stated criterion and is ready for baseline checks of the tombstone and backfill migration pipelines.

Written by the indexing model from the issue text.