Revert "Upgraded frontend-build version to v12"

[alangsto]

Reverts #613

The PR being reverted is causing edits to form fields on the account settings page to error:

Reverting because we would like to release a form for COPPA compliance, but we are blocked from deploying to prod by the errors from this PR.

[alangsto]

fyi @BilalQamar95

[codecov]

Codecov Report

Merging #624 (37a43f2) into master (ad6f812) will decrease coverage by 0.14%.
The diff coverage is 53.96%.

@@            Coverage Diff             @@
##           master     #624      +/-   ##
==========================================
- Coverage   39.24%   39.10%   -0.15%     
==========================================
  Files         109      109              
  Lines        2227     2235       +8     
  Branches      597      598       +1     
==========================================
  Hits          874      874              
- Misses       1268     1276       +8     
  Partials       85       85              

Impacted Files	Coverage Δ
src/account-settings/AccountSettingsPage.jsx	0.00% <0.00%> (ø)
src/account-settings/EditableField.jsx	73.91% <ø> (ø)
src/account-settings/coaching/CoachingToggle.jsx	0.00% <0.00%> (ø)
src/account-settings/data/reducers.js	0.00% <0.00%> (ø)
src/account-settings/data/selectors.js	0.00% <ø> (ø)
.../account-settings/delete-account/DeleteAccount.jsx	68.57% <ø> (ø)
...ount-settings/demographics/DemographicsSection.jsx	87.75% <ø> (ø)
...ount-settings/reset-password/ConfirmationAlert.jsx	0.00% <0.00%> (ø)
...settings/reset-password/RequestInProgressAlert.jsx	0.00% <0.00%> (ø)
.../account-settings/reset-password/ResetPassword.jsx	0.00% <0.00%> (ø)
... and 18 more

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[abdullahwaheed]

@alangsto ValidationFormGroup is removed in #612 and i have tested this locally. I think we should merge it and this issue will automatically resolve

[schenedx]

This is a huge PR to revert.
I am wondering if we can fix forward.
Do we know the root cause of the bug where the edit name button leads directly to error view?