Summary:
1. Unclear why Embed fails often. Locally, it fails for me every time, and
this tweak makes it pass (while still keeping the test useful).
2. Reduced back main bundle's size by removing dependency of some common
elements on the full AdminPanel. Updated expected size of errorPages
bundle to the new reduced size.
Test Plan: No changes to functionality; relying on existing tests to verify that.
Reviewers: jordigh
Reviewed By: jordigh
Subscribers: georgegevoian, jordigh
Differential Revision: https://phab.getgrist.com/D4315
