sage.misc.temporary_file: Remove use of SAGE_TMP

[mkoeppe]

(split out from #33213)

Until tmp_filename and tmp_dir are eliminated from the library, we don't want them cluttering up /tmp. In typical usage, this is easy enough to avoid by using one parent temporary directory to contain all the other temporary files and directories, and then removing that one parent as sage exits.

CC: @orlitzky

Component: refactoring

Author: Michael Orlitzky

Branch: bd76501

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/33797

[mkoeppe]

Branch: u/mkoeppe/sage_misc_temporary_file__remove_use_of_sage_tmp

[mkoeppe]

Commit: bd76501

[mkoeppe]

New commits:

4182565	Trac #33213: remove SAGE_TMP from tmp_dir() and tmp_filename().
bd76501	Trac #33213: clean up after tmp_filename() and tmp_dir() for now.

[vbraun]

Changed branch from u/mkoeppe/sage_misc_temporary_file__remove_use_of_sage_tmp to bd76501

[seblabbe]

Changed commit from bd76501 to none

[seblabbe]

comment:6

a follow-up is at #33944