[Chapel Merge] Deprecate ChapelEnv.CHPL_AUX_FILESYS for real

Branch: refs/heads/main
Revision: adb8242
Author: bradcray
Link: https://github.com/chapel-lang/chapel/pull/19227
Log Message:

Merge pull request #19227 from bradcray/deprecate-chpl-aux-filesys-for-real

Deprecate ChapelEnv.CHPL_AUX_FILESYS for real

[reviewed by @mppf]

It was commented as deprecated before, but not in a way that anyone
who wasn't going looking for it would notice. Here, I'm using a real
deprecation markup and am removing it from tests that are relying on
it while adding a test that checks that it's deprecated properly.

Modified Files:
A test/deprecated/chplAuxFilesys.chpl

A test/deprecated/chplAuxFilesys.good
M modules/standard/ChapelEnv.chpl
M modules/standard/ChplConfig.chpl
M test/chplenv/printchplenv/printchplenv.chpl
M test/chplenv/printchplenv/printchplenv.precomp
M test/compflags/albrecht/chplenv/chplenv.chpl
M test/compflags/albrecht/chplenv/chplenv.compenv
M test/compflags/albrecht/chplenv/generateChplEnvFiles

Compare: https://github.com/chapel-lang/chapel/compare/1c1a1afa3c2c...adb82427f6b7