Add `apps` bundle size reporting to PRs

We use https://github.com/preactjs/compressed-size-action to add [bundle size change reports to PRs](https://github.com/guardian/dotcom-rendering/pull/7470#issuecomment-1485000220). However, this action is only monitoring the `modern` bundle. We should also monitor the `apps` bundle.

We could set this up to add a separate comment to the PR for the `apps` bundle, or combine it with the report for the `modern` bundle.