sage_setup: Separate installing and cleaning

[mkoeppe]

This is preparation for #28925.

Depends on #30779

CC: @tobiasdiez @dimpase @jhpalmieri

Component: build

Author: Matthias Koeppe

Branch: ad9402f

Reviewer: Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/30780

[mkoeppe]

Branch: u/mkoeppe/sage_setup__separate_installing_and_cleaning

[mkoeppe]

New commits:

4f56517	Duplicate src/setup.py
7980130	Merge branch 't/30779/duplicate_src_setup_py' into t/30780/sage_setup__separate_installing_and_cleaning
9b95628	sage_setup.command.sage_install.sage_install: Rename to sage_install_and_clean, update use it in build/pkgs/sagelib/src/setup.py; refactor through new class sage_install

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 9b95628

[sagetrac-git]

Changed commit from 9b95628 to ad9402f

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

ad9402f

sage_setup.command.sage_install: Fixup: Remove cleaning code (moved to sage_install_and_clean)

[dimpase]

Reviewer: Dima Pasechnik

[dimpase]

comment:7

ok

[mkoeppe]

comment:8

Thanks

[vbraun]

Changed branch from u/mkoeppe/sage_setup__separate_installing_and_cleaning to ad9402f

[embray]

comment:10

Why did this include a whole entire duplicate of setup.py?