test(visual): skip flaky visual test

[ozyx]

Closes #7775

Describe your changes:

Add a fixme to skip the flaky visual test. The test flakes due to content shifting after the initial DOM has loaded. This seems to be caused by loading Open MCT icons. You may have noticed blank icons in some of the snapshots, and I think this issue has the same cause. The icons are not being preloaded and thus load well after the initial DOM content has loaded. Will file a separate issue to fix this and link it here

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Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
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Reviewer Checklist

• Changes appear to address issue?
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.66%. Comparing base (0215a5b) to head (af94408).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7776      +/-   ##
==========================================
- Coverage   57.08%   56.66%   -0.42%     
==========================================
  Files         673      673              
  Lines       27177    27177              
  Branches     2636     2636              
==========================================
- Hits        15513    15399     -114     
- Misses      11336    11447     +111     
- Partials      328      331       +3     

Flag	Coverage Δ
e2e-full	23.57% <ø> (-18.53%)	⬇️
e2e-stable	60.63% <ø> (-0.03%)	⬇️
unit	49.27% <ø> (-0.16%)	⬇️

see 18 files with indirect coverage changes

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