fix: improve login_hint usage on IDPs (#6899)

* only set prompt if no login_hint is set

* update to current state and cleanup

internal/idp/providers/jwt/jwt_test.go

@@ -23,7 +23,7 @@ func TestProvider_BeginAuth(t *testing.T) {
 		encryptionAlg func(t *testing.T) crypto.EncryptionAlgorithm
 	}
 	type args struct {
-		params []any
+		params []idp.Parameter
 	}
 	type want struct {
 		session idp.Session
@@ -55,28 +55,6 @@ func TestProvider_BeginAuth(t *testing.T) {
 				},
 			},
 		},
-		{
-			name: "invalid userAgentID error",
-			fields: fields{
-				issuer:       "https://jwt.com",
-				jwtEndpoint:  "https://auth.com/jwt",
-				keysEndpoint: "https://jwt.com/keys",
-				headerName:   "jwt-header",
-				encryptionAlg: func(t *testing.T) crypto.EncryptionAlgorithm {
-					return crypto.CreateMockEncryptionAlg(gomock.NewController(t))
-				},
-			},
-			args: args{
-				params: []any{
-					0,
-				},
-			},
-			want: want{
-				err: func(err error) bool {
-					return errors.Is(err, ErrMissingUserAgentID)
-				},
-			},
-		},
 		{
 			name: "successful auth",
 			fields: fields{
@@ -89,8 +67,8 @@ func TestProvider_BeginAuth(t *testing.T) {
 				},
 			},
 			args: args{
-				params: []any{
-					"agent",
+				params: []idp.Parameter{
+					idp.UserAgentID("agent"),
 				},
 			},
 			want: want{