Post MVP - As a BC LTD/CC/ULC I want to be warned not to affiliate unless I am altering to become a benefit company.

Not required for MVP - but soon after.

Staff have heard from callers who have entities that are not CPs or Benefit companies that want to use the business registry app. They need to be told they can only use the new app for CPs, Benefit companies or if you are wanting to alter from an LTD or ULC to a benefit company.

For example:
- Community Contribution Companies (CCCs) have passwords but cannot alter to become a benefit company or do any filings in th business registry app
- Extraprovincial companies have passwords but cannot do any filings in the business registry app
- Firms (proprietorships, partnerships, limited partnerships) don't have company passwords so wouldn't be able to affiliate (and we don't have any filings for them to do yet).

Additional validation we could add:
Right now the UI cannot validate entity type because it doesn't know it. This check could be added, either in the UI (with a call to the API to look it up) or in the API (with a new response code for invalid type so that the UI could display something appropriate).