MM-24467- Use new ServiceProviderIdentifier in AuthnRequest (#14725)

* add ServiceProviderIdentifier to config

* Update config, add unit test

* fix unit test, update i18n

* add english translation for error

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

api4/user_test.go

@@ -4599,6 +4599,7 @@ func TestLoginErrorMessage(t *testing.T) {
 		*cfg.SamlSettings.IdpUrl = "https://localhost/adfs/ls"
 		*cfg.SamlSettings.IdpDescriptorUrl = "https://localhost/adfs/services/trust"
 		*cfg.SamlSettings.IdpMetadataUrl = "https://localhost/adfs/metadata"
+		*cfg.SamlSettings.ServiceProviderIdentifier = "https://localhost/login/sso/saml"
 		*cfg.SamlSettings.AssertionConsumerServiceURL = "https://localhost/login/sso/saml"
 		*cfg.SamlSettings.IdpCertificateFile = app.SamlIdpCertificateName
 		*cfg.SamlSettings.PrivateKeyFile = app.SamlPrivateKeyName