feat: Private label email policy (#813)

* Label Policy added

* save

* chore: update docs action

* Save

* Save

* Get colors from DB

* Variables inserted

* Get images from global directory.

* Add tests

* Add tests

* Corrections from mergerequest

* Corrections from mergerequest

* Test corrected.

* Added colors to all notifications.

* Added colors to
Corrected text and formatting.all notifications.

* Spelling error corrected.

* fix: tests

* Merge Branch corrected.

* Step6 added

* Corrections from mergerequest

* fix: generate management

* Formatted texts.

* fix: migrations

Co-authored-by: Florian Forster <florian@caos.ch>
Co-authored-by: adlerhurst <silvan.reusser@gmail.com>
Co-authored-by: Fabiennne <fabienne.gerschwiler@gmail.com>

internal/iam/model/label_policy.go

@@ -0,0 +1,18 @@
+package model
+
+import (
+	"github.com/caos/zitadel/internal/eventstore/models"
+)
+
+type LabelPolicy struct {
+	models.ObjectRoot
+
+	State          PolicyState
+	Default        bool
+	PrimaryColor   string
+	SecondaryColor string
+}
+
+func (p *LabelPolicy) IsValid() bool {
+	return p.ObjectRoot.AggregateID != ""
+}