chore: re-enable a11y checks in visual suite-- minus planning tests

[rukmini-bose]

Addresses #7421 (does not close it)
Closes #7317

Describe your changes:

We disabled a11y checks to get build9 out the door. This re-enables most of them, but leaves the PLAN failures alone.

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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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• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
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• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.64%. Comparing base (34b4091) to head (c25f9e5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7747      +/-   ##
==========================================
- Coverage   57.05%   56.64%   -0.41%     
==========================================
  Files         673      673              
  Lines       27177    27177              
  Branches     2636     2636              
==========================================
- Hits        15506    15395     -111     
- Misses      11342    11451     +109     
- Partials      329      331       +2     

Flag	Coverage Δ
e2e-full	23.57% <ø> (-18.55%)	⬇️
e2e-stable	60.63% <ø> (+<0.01%)	⬆️
unit	49.25% <ø> (-0.17%)	⬇️

see 16 files with indirect coverage changes

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