Slice 3: Extract e2e application

[fungairino]

https://www.notion.so/pixiebrix/Phase-1-Convert-Extension-Repo-to-a-Mono-Repo-Using-NX-57238a56ebdd4231bef4ef7613e651d3?pvs=4#13743b21a2538037ac2bf3d90b37812c

[fungairino]

I think we need to punt on this one until we merge the app into the monorepo. The e2e package depends on logic from "@/runtime/brickYaml", which we would need to extract to a library. However this same module is imported by the app. I'd prefer if we didn't duplicate code just for this issue - we can tackle this at the same time once merged.

[grahamlangford]

Let's go ahead and remove it from this epic and plug it in the appropriate phase/epic when we get there then