test(browser): Add simulated mfe integration test

[github-actions]

Note

The pull request "test(browser): Add simulated mfe integration test" was created by @chargome but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

Adds a very simple integration test for propagating MFE names via scopes

[linear-code]

JS-1924

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #19768, which was included in the 10.44.0 release.