Remove Editor Lite (Source Editor) from refactored blob view
Summary
In !57705 (diffs) we implemented Editor Lite (Source Editor) for viewing blobs as part of the Repository Blob View refactor.
We have since identified that the impact of loading the the Source Editor and it's underlying dependency Monaco is too high, and as a result have decided to exclude it from our refactor plan.
LCP went from ~2.6s to ~4.2s with a significant increase in bundle size, outweighing the benefits we would've got from the Source Editor.
This issue proposes removing the the use of Source Editor from the blob view refactor.
Changes in the following MRs should be reverted: