Move yarn new templates from @backstage/cli to @backstage/cli-module-new

The built-in templates used by `yarn new` are moved from `packages/cli/templates/`
to `packages/cli-module-new/templates/`, colocating them with the code that
consumes them.

A backwards compatibility rewrite in the template resolution ensures that
existing `@backstage/cli/templates/*` references in root `package.json`
configurations continue to work by transparently resolving them to
`@backstage/cli-module-new/templates/*`.

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

packages/cli-module-new/package.json

@@ -19,9 +19,11 @@
   "license": "Apache-2.0",
   "main": "src/index.ts",
   "types": "src/index.ts",
+  "bin": "bin/backstage-cli-module-new",
   "files": [
     "dist",
-    "bin"
+    "bin",
+    "templates"
   ],
   "scripts": {
     "build": "backstage-cli package build",
@@ -57,6 +59,5 @@
     "@types/inquirer": "^8.1.3",
     "@types/lodash": "^4.14.151",
     "@types/recursive-readdir": "^2.2.0"
-  },
-  "bin": "bin/backstage-cli-module-new"
+  }
 }