Spring Security Remove SAML Deprecations
- [x] Remove RelyingPartyRegistration deprecations
- [x] Remove Saml2AuthenticationRequestFactory, Saml2AuthenticationRequestContext, Saml2AuthenticationRequestContextResolver, and implementations
- [x] Remove Saml2AuthenticationRequest
- [x] Remove Saml2X509Credentials from credentials package
- [x] Remove Saml2Error from authentication package
- [x] Remove Saml2AuthenticationToken deprecations
- [x] Remove Saml2WebSsoAuthenticationRequestFilter deprecations
- [x] Remove Saml2AuthenticationTokenConverter and Saml2MetadataFilter deprecations
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