bug#58503: 29.0.50; eshell, with remote pwd, diff between folders doesn't create a *Diff* buffer

[miha]

Steps to reproduce:

M-x eshell
cd into a remote directory, for example 'cd /sudo::~/'
compare two existing folders with 'diff a/ b/' or 'diff -r a/ b/'

Eshell prints diff output into the *eshell* buffer instead of displaying
a *Diff* buffer. This isn't an issue in a local pwd.

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