fix: cleanup editor state from migratedFrom in DT

Author: AbhishekA1509

src/Pages/Applications/DevtronApps/Details/AppConfigurations/DeploymentTemplate/types.ts

@@ -147,18 +147,13 @@ interface BaseDeploymentTemplateConfigState {
     isOverridden?: never
     environmentConfig?: never
     mergeStrategy?: never
-    migratedFrom?: never
 }
 
 type EnvironmentOverrideDeploymentTemplateConfigState = {
     chartConfig?: never
     isOverridden: boolean
     environmentConfig: EnvironmentConfigType
     mergeStrategy: OverrideMergeStrategyType
-    /**
-     * Readonly flag to show the user that the pipeline is migrated from external app to devtron, and can't change its version or delete override
-     */
-    migratedFrom: PipelineMigratedFromType
 }
 
 export interface DeploymentTemplateConfigCommonState extends SelectedChartDetailsType {