fix: revert production js chunk names

[pi0]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

We started using human readable names as part of production chunks (#7463) but then multiple regressions reported (some history at #7808) and also currently #7994 and #7882 are open.

So even tough previous regressions resolved and current open issues can be fixed, it seems not worth keep supporting it for nuxt@2. Will continue this for nuxt@3 with more tests (and probably only for limited async and initial chunks not all)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-commenter]

Codecov Report

Merging #8012 into dev will increase coverage by 0.14%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##              dev    #8012      +/-   ##
==========================================
+ Coverage   68.87%   69.02%   +0.14%     
==========================================
  Files          91       91              
  Lines        3849     3835      -14     
  Branches     1043     1039       -4     
==========================================
- Hits         2651     2647       -4     
+ Misses        972      965       -7     
+ Partials      226      223       -3     

Flag	Coverage Δ
#unittests	69.02% <75.00%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
packages/webpack/src/config/client.js	69.44% <ø> (+6.94%)	⬆️
packages/webpack/src/config/base.js	64.45% <50.00%> (-0.18%)	⬇️
packages/config/src/config/build.js	100.00% <100.00%> (ø)
packages/config/src/load.js	77.90% <0.00%> (ø)

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