feat: saml application configuration for login version (#9351)

# Which Problems Are Solved

OIDC applications can configure the used login version, which is
currently not possible for SAML applications.

# How the Problems Are Solved

Add the same functionality dependent on the feature-flag for SAML
applications.

# Additional Changes

None

# Additional Context

Closes #9267
Follow up issue for frontend changes #9354

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/domain/application_saml.go

@@ -7,11 +7,13 @@ import (
 type SAMLApp struct {
 	models.ObjectRoot
 
-	AppID       string
-	AppName     string
-	EntityID    string
-	Metadata    []byte
-	MetadataURL string
+	AppID        string
+	AppName      string
+	EntityID     string
+	Metadata     []byte
+	MetadataURL  string
+	LoginVersion LoginVersion
+	LoginBaseURI string
 
 	State AppState
 }