add further data grid coverage testing

[gdams]

Description of change

Pinning the mui data grid at 6.1.0 for now as it's the latest one that works with react testing library. (mui/mui-x#1151)

Also added @steelhead31's profile image as it's been trying to do this for weeks (we normally check them in)

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[codecov]

Codecov Report

Merging #1758 (f18df63) into main (d1509b8) will increase coverage by 0.29%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1758      +/-   ##
==========================================
+ Coverage   97.62%   97.92%   +0.29%     
==========================================
  Files          84       84              
  Lines        6031     6034       +3     
  Branches      481      486       +5     
==========================================
+ Hits         5888     5909      +21     
+ Misses        143      125      -18     

Impacted Files	Coverage Δ
src/__fixtures__/hooks.tsx	100.00% <100.00%> (ø)
src/__fixtures__/page.tsx	100.00% <100.00%> (ø)
src/components/ReleaseNotesRender/index.tsx	100.00% <100.00%> (+10.16%)	⬆️

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