frontend-build updated to v12

[BilalQamar95]

Ticket:
42: Upgrade eslint to v8.x

What changed?

• Updated frontend-build to v12 (Eslint was updated in frontend-build version resulting in it's version being bumped to v12. This PR updates frontend-build to reciprocate eslint version update)
• Resolved eslint issues post update

[codecov-commenter]

Codecov Report

Merging #277 (a81dcd8) into master (f97a311) will increase coverage by 0.71%.
The diff coverage is 84.21%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   59.13%   59.85%   +0.71%     
==========================================
  Files          14       14              
  Lines         279      279              
  Branches       67       67              
==========================================
+ Hits          165      167       +2     
+ Misses        113      111       -2     
  Partials        1        1              

Impacted Files	Coverage Δ
src/Avatar.jsx	0.00% <0.00%> (ø)
src/learning-header/AnonymousUserMenu.jsx	66.66% <50.00%> (+33.33%)	⬆️
src/Header.jsx	91.17% <100.00%> (ø)
src/Icons.jsx	66.66% <100.00%> (ø)
src/Logo.jsx	100.00% <100.00%> (ø)
src/Menu/Menu.jsx	30.70% <100.00%> (+0.47%)	⬆️
src/learning-header/AuthenticatedUserDropdown.jsx	88.88% <100.00%> (ø)
src/learning-header/LearningHeader.jsx	88.23% <100.00%> (+0.73%)	⬆️

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