Changes to Update authentication method

added the optional property authentication_method/internal_mcp_read_only to the response with the 200 status

added the optional property authentication_method/internal_mcp_enabled to the response with the 200 status

the email request property default value email was added

the first_name request property default value first_name was added

the groups request property default value groups was added

the identity request property default value email was added

the last_name request property default value last_name was added

the saml_digest_algorithm request property default value sha256 was added

the saml_signature_algorithm request property default value rsa-sha256 was added

the email response's property default value email was added for the status 200

the first_name response's property default value first_name was added for the status 200

the groups response's property default value groups was added for the status 200

the identity response's property default value email was added for the status 200

the last_name response's property default value last_name was added for the status 200

the saml_digest_algorithm response's property default value sha256 was added for the status 200

the saml_signature_algorithm response's property default value rsa-sha256 was added for the status 200