Remove tox dependency on pytest-travis-fold

[EddyMM]

Description of changes

• Tests run using Github actions now, not TravisCI.
• The pytest-travis-fold module is no longer necessary.

Tests

• Current Github Actions Succeed
• Before these changes: https://github.com/aws/aws-parallelcluster/actions/runs/6075753710/job/16482877413?pr=5672

References

• missing dependency on py abusalimov/pytest-travis-fold#11

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

Please review the guidelines for contributing and Pull Request Instructions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (13a529b) 89.89% compared to head (57a45bf) 89.89%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5685   +/-   ##
========================================
  Coverage    89.89%   89.89%           
========================================
  Files          179      179           
  Lines        15378    15378           
========================================
  Hits         13824    13824           
  Misses        1554     1554           

Flag	Coverage Δ
unittests	89.89% <ø> (ø)

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