Decouple OSU benchmarks from EFA integration tests

[judysng]

Description of changes

• Originally, OSU benchmark tests were nested inside EFA integration tests, so this PR makes a new test_osu.py and separated the OSU tests from EFA
  • This is placed in the performance_tests folder, along with a new cluster config specifically using c5n.18xlarge and the benchmarks
• OSU benchmarks could also be run from other tests (test_ad_integration, test_multiple_efs, test_multiple_fsx, and test_hit_disable_hyperthreading) if the test config option "benchmarks" was set.
  • This PR also removes the benchmark config sections from those tests and deletes the extra code in those tests that uses the fixture and runs the test
  • The actual fixture and test config option is left though, just in case for future use

Tests

• Ran integration tests for each of the tests modified (osu, efa, efs, ad_integration, fsx, and disable_hyperthreading)

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

All modified and coverable lines are covered by tests ✅

Comparison is base (dffb3a0) 90.15% compared to head (823f895) 90.15%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #5928   +/-   ##
========================================
  Coverage    90.15%   90.15%           
========================================
  Files          180      180           
  Lines        15742    15742           
========================================
  Hits         14192    14192           
  Misses        1550     1550           

Flag	Coverage Δ
unittests	90.15% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.