ci: remove 'Upload failed tests' directories' step from linux32 jobs

ci: remove 'Upload failed tests' directories' step from linux32 jobs

Linux32 jobs seem to be getting:

    Error: This request has been automatically failed because it uses a
    deprecated version of `actions/upload-artifact: v1`. Learn more:
    https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/

before doing anything useful.  For now, disable the step.

Ever since actions/upload-artifact@v1 got disabled, mentioning the
offending version of it seems to stop anything from happening.  At
least this should run the same build and test.

See

    https://github.com/git/git/actions/runs/10780030750/job/29894867249

for example.

Signed-off-by: Junio C Hamano <gitster@pobox.com>