Test warnings errors

[alexander-akait]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Yes

Motivation / Use-Case

Output warnings and errors together, also fix logging for internal webpack logger + e2e tests

Breaking Changes

No

Additional Info

Better output all errors and warnings instead only one

[codecov]

Codecov Report

Merging #3441 (8e9a635) into master (809631c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 8e9a635 differs from pull request most recent head 5c8166d. Consider uploading reports for the commit 5c8166d to get more accurate results

@@           Coverage Diff           @@
##           master    #3441   +/-   ##
=======================================
  Coverage   94.77%   94.77%           
=======================================
  Files          34       34           
  Lines        1358     1360    +2     
  Branches      401      403    +2     
=======================================
+ Hits         1287     1289    +2     
  Misses         66       66           
  Partials        5        5           

Impacted Files	Coverage Δ
client-src/index.js	91.15% <100.00%> (+0.07%)	⬆️
lib/Server.js	94.84% <100.00%> (+0.01%)	⬆️

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