TST: add usage of pytest-rerunfailures for remote-tests

[bsipocz]

This PR also adds online to tox to deal with remote-data dependencies and cmd options

The actual parameters may need some tuning, as well as keeping an eye on pytest-dev/pytest-rerunfailures#193 as it would be more optimal for us to come back and revisit our failing test at the end of the test run.

Note: second commit temporarily disables the cron conditional, it will need to be removed once we make sure the configs are picked up properly (the CI job will most certainly fail)

To close #2424

[codecov]

Codecov Report

Merging #2427 (432f141) into main (be0938f) will not change coverage.
The diff coverage is n/a.

❗ Current head 432f141 differs from pull request most recent head c194d86. Consider uploading reports for the commit c194d86 to get more accurate results

@@           Coverage Diff           @@
##             main    #2427   +/-   ##
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  Coverage   62.97%   62.97%           
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  Files         133      133           
  Lines       17290    17290           
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  Hits        10888    10888           
  Misses       6402     6402           

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[bsipocz]

I've cancelled the CI once it demonstrated that all configs are picked up correctly:

../../.tox/py39-test-alldeps-devdeps-online/lib/python3.9/site-packages/astroquery/alma/tests/test_alma_remote.py::TestAlma::test_download_and_extract PASSED [  1%]
../../.tox/py39-test-alldeps-devdeps-online/lib/python3.9/site-packages/astroquery/alma/tests/test_alma_remote.py::TestAlma::test_doc_example RERUN [  1%]
../../.tox/py39-test-alldeps-devdeps-online/lib/python3.9/site-packages/astroquery/alma/tests/test_alma_remote.py::TestAlma::test_doc_example FAILED [  1%]

I go ahead and remove the temporary config, and go ahead and merge without waiting for CI as it only affects the cron jobs.