Onboard this repository to BundleWatch so that we can track bundle sizes. Follow https://bundlewatch.io/guide/getting-started. Make it track the same bundles as codecov is tracking. Note that we have added new bundles in #7032.

I have already configured BUNDLEWATCH_GITHUB_TOKEN action environment secret.

We want to track bundle sizes in main branch, then each PR, and have a comment on each PR that shows how much each bundle size will change if we were to merge that PR.