Type of change

• Bug fix
• New feature development
• Tech debt (refactoring, code cleanup, dependency upgrades, etc)
• Build/deploy pipeline (DevOps)
• Other

Objective

1. SAML Artifact Binding settings were removed in CSA-6 Remove artifact binding from SSO config UI web#1502 and CSA-6 Fix/remove artifact binding server#1885, but still remained in the SsoConfigApi model, and I accidentally reintroduced some in Improve SSO Config validation #572.

2. Clean up some unused code that I didn't end up needing in the SSO Config Form refactor.

Code changes

1. Remove unused properties and enum value.
2. Remove unused validators.

Testing requirements

Will be covered by general regression testing and testing of bitwarden/web#1332 once merged.

Before you submit

• I have checked for linting errors (npm run lint) (required)
• I have added unit tests where it makes sense to do so (encouraged but not required)
• This change requires a documentation update (notify the documentation team)
• This change has particular deployment requirements (notify the DevOps team)