I also hate whitespace but it's just a symptom (the other developers' editors / git config probably don't show the trailing whitespace).
Given this, it's a mere symptomatic remedy, the problem will reappear, and the only person benefiting from this is you. I'd hate to pay you for that.
I'd probably address it more completely if so many files are going to be touched, and whitespace is only one symptom of bad formatting connections. Perhaps everyone should employ the same formatter on save, for example. There is far more value in that. Getting rid of only superfluous whitespace is a bit of a time sink for what you get in return (as much as it drives me nuts).
An easy way to sync formatting: https://editorconfig.org/
it takes a while to learn how to use your text editor well, and everyone is probably good at a different one. but they all pretty well have the ability to produce the same result, so why bother forcing one?
it's better to (have a tool that can) specify what the end result should look like and let people work the way that they are good at.
Nobody has a problem with this, although in the Java world every corporate developer uses IntelliJ anyway. A couple of legacy project teams are still on Eclipse.
I can understand wanting to standardize in a company with a 1000-person engineering org, where maybe it's harder to enforce that everyone uses the same conventions if there's no standardization in tools; but in a team of a few dozen, you should only be hiring people you trust anyway, and communicating with them about why small things like this are important.
[1] And that's assuming your chosen editor is objectively comparable in features with the one they used, which it probably isn't unless it's the one extensible in Lisp ;)
If you're not pairing, it seems like a move with a poor payoff for its cost. Sure, make sure everyone has identical code style in their auto-formatter, but let them pick their own editor.