feat(idp): provide option to auto link user (#7734)

* init auto linking

* prompt handling

* working

* translations

* console

* fixes

* unify

* custom texts

* fix tests

* linting

* fix check of existing user

* fix bg translation

* set unspecified as default in the form

internal/domain/idp.go

@@ -126,3 +126,11 @@ func (s IDPIntentState) Valid() bool {
 func (s IDPIntentState) Exists() bool {
 	return s != IDPIntentStateUnspecified && s != IDPIntentStateFailed //TODO: ?
 }
+
+type AutoLinkingOption uint8
+
+const (
+	AutoLinkingOptionUnspecified AutoLinkingOption = iota
+	AutoLinkingOptionUsername
+	AutoLinkingOptionEmail
+)