[Replacement]: Replace `tmp-promise` with Node `mkdtempDisposable()`

[slorber]

Package to replace

tmp-promise

Suggested replacement(s)

After seeing https://bsky.app/profile/43081j.com/post/3mmvqatbfr22r, I tried to migrate away from tmp-promise used in our unit tests.

Turns out Explicit Resource Management + Node native API mkdtempDisposable() is a good alternative and could even simplify unit tests (no manual cleanup needed), although the syntax might feel a bit awkward (no void operator, no await using {destructured}.

See lib removal PR PR facebook/docusaurus#12106

Manifest type

native (replaceable by a built-in platform feature)

Rationale

Unneeded lib, similar to tmp, temp, and others

Availability

Node v24.4.0

Code example (optional)

Many here: facebook/docusaurus#12106