SDK-1316 Test new errors

[jhaven-stytch]

Linear Ticket: SDK-1316

Changes:

1. Make DeeplinkHandledStatus report only a subset of SDKErrors for better DX
2. Minor refactoring for easier testing
3. Add some missing tests
4. Remove out some unused biometric-specific errors. On Android and iOS we expose the same information in an availability object (or a simple boolean). RN will be updated to match

Notes:

• Not really a lot in this PR, but that's a good thing, because the other errors are already being tested for in existing tests

Checklist:

• I have verified that this change works in the relevant demo app, or N/A
• I have added or updated any tests relevant to this change, or N/A
• I have updated any relevant README files for this change, or N/A

[susie-stytch]

👍