Replace three ascii dots with the unicode ellipsis in the c++ code

[Qrox]

Summary

SUMMARY: None

Purpose of change

Replace the currently pervasive usage of three ascii dots in the c++ code with actual unicode ellipses.

Describe the solution

Ran the clang-tidy text style check to do the replacement.

Describe alternatives you've considered

According to #34492, some fonts have poor support for unicode symbols, so this might not work well for the user of such fonts. I think the ultimate solution would be using fallback fonts, similar to the way unsupported symbols are handled in a browser, etc, but if it turns out to not work, we can hold off this change and disable the ellipses check in clang-tidy for the time being.

[kevingranade]

I am not aware of a way to even detect missing characters in curses, much less do anything about it.
The only thing that comes to mind is providing alternate strings for any unicode strings we use and toggling back to the ascii version with an option.