chore(ui): drop the unused deployment-mode variable (#12131)

ui/changelog.d/drop-unused-deployment-mode-env.removed.md

@@ -0,0 +1 @@
+Removed the unused `NEXT_PUBLIC_PROWLER_DEPLOYMENT_MODE` variable and its `getDeploymentMode` helper; no build ever set it and nothing read the result, so Cloud versus self-hosted behavior is decided solely by the runtime `UI_CLOUD_ENABLED` flag

ui/lib/deployment.ts

@@ -1,23 +1,5 @@
 import { isCloud } from "./shared/env";
 
-export const DEPLOYMENT_MODE = {
-  CLOUD: "cloud",
-  ON_PREMISE: "onpremise",
-} as const;
-
 export const PROWLER_CLOUD_ONLY_TOOLTIP = "Available only in Prowler Cloud";
 
-export type DeploymentMode =
-  (typeof DEPLOYMENT_MODE)[keyof typeof DEPLOYMENT_MODE];
-
-export const getDeploymentMode = (): DeploymentMode | undefined => {
-  const mode = process.env.NEXT_PUBLIC_PROWLER_DEPLOYMENT_MODE;
-
-  if (mode === DEPLOYMENT_MODE.CLOUD || mode === DEPLOYMENT_MODE.ON_PREMISE) {
-    return mode;
-  }
-
-  return undefined;
-};
-
 export const isGroupedJiraDispatchEnabled = (): boolean => isCloud();