Improve the problems mentioned in #45080.
- Adding error retries (3 attempts) to font fetching. When you have a slow network, it might take >3s to load.
- Improve the error message to tell you that you might have unstable network connection.
- Do not cause build error (caused by missing `AbortController`) in Node 14 (even if we don't support Node 14, better to pass the build instead of hard error).
702d3d291c