Cloud migrations: create endpoint to create an access token (#84690)

* fix merge conflicts

* make token expiration configurable

pkg/setting/setting.go

@@ -495,7 +495,7 @@ type Cfg struct {
 	PublicDashboardsEnabled bool
 
 	// Cloud Migration
-	CloudMigrationIsTarget bool
+	CloudMigration CloudMigrationSettings
 
 	// Feature Management Settings
 	FeatureManagement FeatureMgmtSettings
@@ -1996,8 +1996,3 @@ func (cfg *Cfg) readPublicDashboardsSettings() {
 	publicDashboards := cfg.Raw.Section("public_dashboards")
 	cfg.PublicDashboardsEnabled = publicDashboards.Key("enabled").MustBool(true)
 }
-
-func (cfg *Cfg) readCloudMigrationSettings() {
-	cloudMigration := cfg.Raw.Section("cloud_migration")
-	cfg.CloudMigrationIsTarget = cloudMigration.Key("is_target").MustBool(false)
-}