[tests] Apply PEP8 linting

[cbentejac]

Description

This PR applies PEP8 linting to the tests module and fixes the following issues:

• E302: expected 2 blank lines, found 1.
• W292: no newline at end of file.
• E128: continuation line under-indented for visual indent.
• E251: unexpected spaces around keyword / parameter equals.
• W293: blank line contains whitespace.
• F541: f-string is missing placeholders.
• E261: at least two spaces before inline comment.
• E712: comparison to True should be 'if cond is True:' or 'if cond'.
• E303: too many blank lines.
• E711: comparison to None should be 'if cond is None'.
• E222: multiple spaces after operator.
• E225: missing whitespace around operator.
• E306: expected 1 blank line before a nested definition, found 0.
• E301: expected 1 blank line, found 0.
• W291: trailing whitespaces.
• F401: 'xxx' imported but not used.
• W391: blank line at end of file.
• F841: local 'var' assigned to but never used.
• E275: missing whitespace after keyword.

[gemini-code-assist]

Code Review

This pull request performs code formatting, whitespace cleanup, and simplifies boolean assertions across several test files. The review feedback highlights a few issues in the test files, including a copy-paste error in NestedTest.py where the parameter 'y' is incorrectly labeled as 'z', a docstring mismatch in PluginSubmitter.py where PluginSubmitterA1 is described as having a dynamic node size despite using a static one, and a minor typo in another docstring.

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[codecov]

Codecov Report

❌ Patch coverage is 93.84615% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.38%. Comparing base (dc21cee) to head (88e4291).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...lugins/meshroom/pluginSubmitter/PluginSubmitter.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3124      +/-   ##
===========================================
- Coverage    85.38%   85.38%   -0.01%     
===========================================
  Files           73       73              
  Lines        11406    11404       -2     
===========================================
- Hits          9739     9737       -2     
  Misses        1667     1667              

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