fix: jest configuration changes to allow is-plain-obj esm

[rjchow]

All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Due to some upstream changes including a package that uses ESM, jest needs to transform such files before it can be run.

How to test the changes in this Pull Request:

Purely a dev env change; Jest tests should pass both in CI and locally

1. Try commands such as git clean -fdx && pnpm i && pnpm run build && cd ./plugins/woocommerce-admin && pnpm run test
2. And also attempt to run tests within the packages themselves

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Have you created a changelog file for each project being changed, ie pnpm changelog add --filter=<project>?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.