ci: Replace setup-miniconda with test-infra version (#84236)
Replaces our use of the conda-incubator version of setup-miniconda with
one that's more tailored to our specific needs.
Should address issues highlighted in https://github.com/pytorch/pytorch/issues/84196
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84236
Approved by: https://github.com/atalman, https://github.com/janeyx99, https://github.com/malfet
