Sync tests with openfl develop branch

[scap3yvt]

Fixes #N.A.

Proposed Changes

• updated nomenclature and api of openfl tests per latest changes in openfl develop

Checklist

• I have read the CONTRIBUTING guide.
• My PR is based from the current GaNDLF master .
• Non-breaking change (does not break existing functionality): provide as many details as possible for any breaking change.
• Function/class source code documentation added/updated.
• Code has been blacked for style consistency.
• If applicable, version information has been updated in GANDLF/version.py.
• If adding a git submodule, add to list of exceptions for black styling in pyproject.toml file.
• Usage documentation has been updated, if appropriate.
• Tests added or modified to cover the changes; if coverage is reduced, please give explanation.
• If customized dependency installation is required (i.e., a separate pip install step is needed for PR to be functional), please ensure it is reflected in all the files that control the CI, namely: python-test.yml, and all docker files [1,2,3].

[github-actions]

MLCommons CLA bot All contributors have signed the MLCommons CLA ✍️ ✅

[sarthakpati]

LGTM

[sarthakpati]

@psfoley: I think this seems to be an acceptable fix. Thoughts?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c6a42a8) 94.68% compared to head (ca4f44b) 94.68%.
Report is 4 commits behind head on master.

❗ Current head ca4f44b differs from pull request most recent head 6436fdd. Consider uploading reports for the commit 6436fdd to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #772   +/-   ##
=======================================
  Coverage   94.68%   94.68%           
=======================================
  Files         117      117           
  Lines        8242     8242           
=======================================
  Hits         7804     7804           
  Misses        438      438           

Flag	Coverage Δ
unittests	94.68% <ø> (ø)

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