fix(testing): remove --no-experimental-strip-types flag and add CJS migration

## Current Behavior
On Node.js v24+, the `@nx/jest/plugin` sets `--no-experimental-strip-types` in
NODE_OPTIONS which causes an error: "node: --no-experimental-strip-types is not
allowed in NODE_OPTIONS".

Additionally, `jest.config.ts` files using ESM syntax (`export default`,
`import`) fail to load correctly under Node.js type-stripping when the project
is configured for CommonJS.

## Expected Behavior
- Remove the NODE_OPTIONS manipulation that adds `--no-experimental-strip-types`
- Add a migration (22.2.0-beta.2) that converts `jest.config.ts` files from ESM
  to CJS syntax for projects using `@nx/jest/plugin`
- The migration only runs when `@nx/jest/plugin` is registered in `nx.json`
- Projects with `type: module` are warned as they're incompatible with the plugin
- Files using ESM-only features (import.meta, top-level await) are skipped with
  a warning for manual conversion

## Related Issue(s)
Fixes NXC-3541

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jaysoo

packages/jest/migrations.json

@@ -29,6 +29,11 @@
       },
       "description": "Replace removed matcher aliases in Jest v30 with their corresponding matcher",
       "implementation": "./src/migrations/update-21-3-0/replace-removed-matcher-aliases"
+    },
+    "convert-jest-config-to-cjs": {
+      "version": "22.2.0-beta.2",
+      "description": "Convert jest.config.ts files from ESM to CJS syntax (export default -> module.exports, import -> require) for projects using CommonJS resolution to ensure correct loading under Node.js type-stripping.",
+      "implementation": "./src/migrations/update-22-2-0/convert-jest-config-to-cjs"
     }
   },
   "packageJsonUpdates": {