texlive package: Fix installs for existing, root-owned texlive

[mkoeppe]

Follow-up on #19853.
If there's an existing root-owned texlive hierarchy, the current script tries to use it but fails with permission errors. Instead,

• it could use tlmgr --usermode to install into a user's ~/texmf,
• or use SAGE_SUDO (If $SAGE_SUDO is set, use it whenever we do "make install" of a package. #21537) to install into the system texlive hierarchy,
• or use tlmgr --usermode --usertree into $SAGE_LOCAL and set environment variables so that the installed stuff is found.

Depends on #31529

CC: @vbraun

Component: packages: experimental

Reviewer: Michael Orlitzky

Issue created by migration from https://trac.sagemath.org/ticket/21922

[mkoeppe]

comment:1

Proposing to close this, as #31529 will remove the texlive install script.

[mkoeppe]

Dependencies: #31529

[orlitzky]

Reviewer: Michael Orlitzky

[orlitzky]

comment:2

Replying to @mkoeppe:

Proposing to close this, as #31529 will remove the texlive install script.

hallelujah