feat: configure codecov reporting

[rishabh3112]

What kind of change does this PR introduce?
feature

Did you add tests for your changes?
N/A
If relevant, did you update the documentation?
No
Summary
Configure reporting of codecov

Does this PR introduce a breaking change?
No

Other information
related to #1899

[codecov]

Codecov Report

Merging #2032 into master will increase coverage by 9.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2032      +/-   ##
==========================================
+ Coverage   59.44%   68.99%   +9.55%     
==========================================
  Files         102       85      -17     
  Lines        2611     2422     -189     
  Branches      518      489      -29     
==========================================
+ Hits         1552     1671     +119     
+ Misses        931      751     -180     
+ Partials      128        0     -128     

Impacted Files	Coverage Δ
packages/migrate/src/bannerPlugin/bannerPlugin.ts	42.85% <0.00%> (ø)
...removeDeprecatedPlugins/removeDeprecatedPlugins.ts	50.00% <0.00%> (ø)
prettier.config.js
commitlint.config.js
setupTest.js
smoketests/watch/watch.single.smoketest.js
lint-staged.config.js
scripts/prepareSuite.js
...grate/src/namedModulesPlugin/namedModulesPlugin.ts
packages/generators/templates/index.js
... and 51 more

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[snitin315]

CI seems super slow 😞

[rishabh3112]

CI seems super slow

Yup, but unrelated to this PR as individual jobs are taking same amount of time as they where before. Issue is that the less number of jobs are not running simultaneously per PR because of sudden increase of commits in repository as a whole.

[snitin315]

hmm, I think we should cancel the previous run manually if we push a new commit.

[alexander-akait]

Great job!

[alexander-akait]

@rishabh3112 Can we focus on skip test

@webpack/cli-team Also we should improve coverage - just more tests, ideally have 95-100% coverage