Feat(auth): Rename authentication to auth (#6229)

**What**
- rename `authenticationModule` -> `authModule`

packages/modules-sdk/src/definitions.ts

@@ -15,7 +15,7 @@ export enum Modules {
   PRODUCT = "productService",
   PRICING = "pricingService",
   PROMOTION = "promotion",
-  AUTHENTICATION = "authentication",
+  AUTH = "auth",
   WORKFLOW_ENGINE = "workflows",
   SALES_CHANNEL = "salesChannel",
   CART = "cart",
@@ -31,7 +31,7 @@ export enum ModuleRegistrationName {
   PRODUCT = "productModuleService",
   PRICING = "pricingModuleService",
   PROMOTION = "promotionModuleService",
-  AUTHENTICATION = "authenticationModuleService",
+  AUTH = "authModuleService",
   WORKFLOW_ENGINE = "workflowsModuleService",
   SALES_CHANNEL = "salesChannelModuleService",
   CART = "cartModuleService",
@@ -48,7 +48,7 @@ export const MODULE_PACKAGE_NAMES = {
   [Modules.CACHE]: "@medusajs/cache-inmemory",
   [Modules.PRICING]: "@medusajs/pricing",
   [Modules.PROMOTION]: "@medusajs/promotion",
-  [Modules.AUTHENTICATION]: "@medusajs/authentication",
+  [Modules.AUTH]: "@medusajs/auth",
   [Modules.WORKFLOW_ENGINE]: "@medusajs/workflow-engine-inmemory",
   [Modules.SALES_CHANNEL]: "@medusajs/sales-channel",
   [Modules.CART]: "@medusajs/cart",
@@ -157,11 +157,11 @@ export const ModulesDefinition: { [key: string | Modules]: ModuleDefinition } =
         resources: MODULE_RESOURCE_TYPE.SHARED,
       },
     },
-    [Modules.AUTHENTICATION]: {
-      key: Modules.AUTHENTICATION,
-      registrationName: ModuleRegistrationName.AUTHENTICATION,
+    [Modules.AUTH]: {
+      key: Modules.AUTH,
+      registrationName: ModuleRegistrationName.AUTH,
       defaultPackage: false,
-      label: upperCaseFirst(ModuleRegistrationName.AUTHENTICATION),
+      label: upperCaseFirst(ModuleRegistrationName.AUTH),
       isRequired: false,
       canOverride: true,
       isQueryable: true,