MM-19867: - Implement allowing multiple SAML Libraries (#13299)

* Implement allowing multiple SAML Libraries

* fix unit tests

* updates based on review feedback

* Only set on startup, not config changes

* update unit tests, reload enterprise

* need to reset for previous tests

* update license statement

* fix licensing line

model/config.go

@@ -797,6 +797,7 @@ type ExperimentalSettings struct {
 	EnableClickToReply              *bool  `restricted:"true"`
 	LinkMetadataTimeoutMilliseconds *int64 `restricted:"true"`
 	RestrictSystemAdmin             *bool  `restricted:"true"`
+	UseNewSAMLLibrary               *bool
 }
 
 func (s *ExperimentalSettings) SetDefaults() {
@@ -819,6 +820,9 @@ func (s *ExperimentalSettings) SetDefaults() {
 	if s.RestrictSystemAdmin == nil {
 		s.RestrictSystemAdmin = NewBool(false)
 	}
+	if s.UseNewSAMLLibrary == nil {
+		s.UseNewSAMLLibrary = NewBool(false)
+	}
 }
 
 type AnalyticsSettings struct {