E2C: Add Public Preview banner (#90922)

* E2C: Add public preview message

* Read feedback URL from the settings

* Translate strings

* Add missing translation

* Add missing translation[2]

pkg/api/dtos/frontend_settings.go

@@ -256,7 +256,8 @@ type FrontendSettingsDTO struct {
 	PublicDashboardAccessToken string `json:"publicDashboardAccessToken"`
 	PublicDashboardsEnabled    bool   `json:"publicDashboardsEnabled"`
 
-	CloudMigrationIsTarget bool `json:"cloudMigrationIsTarget"`
+	CloudMigrationIsTarget    bool   `json:"cloudMigrationIsTarget"`
+	CloudMigrationFeedbackURL string `json:"cloudMigrationFeedbackURL"`
 
 	DateFormats setting.DateFormats `json:"dateFormats,omitempty"`
 

pkg/api/frontendsettings.go

@@ -223,6 +223,7 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 		PublicDashboardAccessToken:          c.PublicDashboardAccessToken,
 		PublicDashboardsEnabled:             hs.Cfg.PublicDashboardsEnabled,
 		CloudMigrationIsTarget:              isCloudMigrationTarget,
+		CloudMigrationFeedbackURL:           hs.Cfg.CloudMigration.FeedbackURL,
 		SharedWithMeFolderUID:               folder.SharedWithMeFolderUID,
 		RootFolderUID:                       accesscontrol.GeneralFolderUID,
 		LocalFileSystemAvailable:            hs.Cfg.LocalFileSystemAvailable,