Add @backstage/cli-defaults package

Introduces a new `@backstage/cli-defaults` package that re-exports all
standard CLI modules as a single array, simplifying dependency management
for consumers. The CLI's `CliInitializer` is updated to support array
exports alongside single module exports. The create-app template,
changesets, and CLI fallback are updated to use `@backstage/cli-defaults`
instead of listing 11 individual modules.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/cli-defaults/package.json

@@ -0,0 +1,48 @@
+{
+  "name": "@backstage/cli-defaults",
+  "version": "0.0.0",
+  "description": "Default set of CLI modules for the Backstage CLI",
+  "backstage": {
+    "role": "cli-module"
+  },
+  "publishConfig": {
+    "access": "public",
+    "main": "dist/index.cjs.js",
+    "types": "dist/index.d.ts"
+  },
+  "homepage": "https://backstage.io",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/backstage/backstage",
+    "directory": "packages/cli-defaults"
+  },
+  "license": "Apache-2.0",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "backstage-cli package build",
+    "clean": "backstage-cli package clean",
+    "lint": "backstage-cli package lint",
+    "prepack": "backstage-cli package prepack",
+    "postpack": "backstage-cli package postpack"
+  },
+  "dependencies": {
+    "@backstage/cli-module-auth": "workspace:^",
+    "@backstage/cli-module-build": "workspace:^",
+    "@backstage/cli-module-config": "workspace:^",
+    "@backstage/cli-module-create-github-app": "workspace:^",
+    "@backstage/cli-module-info": "workspace:^",
+    "@backstage/cli-module-lint": "workspace:^",
+    "@backstage/cli-module-maintenance": "workspace:^",
+    "@backstage/cli-module-migrate": "workspace:^",
+    "@backstage/cli-module-new": "workspace:^",
+    "@backstage/cli-module-test-jest": "workspace:^",
+    "@backstage/cli-module-translations": "workspace:^"
+  },
+  "devDependencies": {
+    "@backstage/cli": "workspace:^"
+  }
+}