(split out from #33213)

We have historically massaged TMPDIR and TMP when interfacing with ECL to ensure that SAGE_TMP was used consistently for temporary
files. Simply removing this code seems to do the trick, since ECL
wants to use the system location by default.

Depends on #33829

CC: @orlitzky @spaghettisalat @nbruin

Component: interfaces

Author: Michael Orlitzky

Branch/Commit: 4610b1c

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/33790