refactor: leverage helpers for smoketests

[jamesgeorge007]

What kind of change does this PR introduce?
refactoring

Did you add tests for your changes?
Update smoke tests

If relevant, did you update the documentation?
Nope

Summary
This PR aims at refactoring the smoke test suite by introducing helpers.
#2493

Does this PR introduce a breaking change?
Nope

Other information
N/A

[codecov]

Codecov Report

Merging #2519 (107a85d) into master (4fccb73) will increase coverage by 18.21%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2519       +/-   ##
===========================================
+ Coverage   72.60%   90.82%   +18.21%     
===========================================
  Files          46       29       -17     
  Lines        2234     1449      -785     
  Branches      603      411      -192     
===========================================
- Hits         1622     1316      -306     
+ Misses        612      133      -479     

Impacted Files	Coverage Δ
packages/generators/src/utils/scaffold-utils.ts	52.38% <0.00%> (-42.86%)	⬇️
packages/webpack-cli/lib/bootstrap.js	80.00% <0.00%> (-20.00%)	⬇️
...kages/webpack-cli/lib/utils/get-package-manager.js	57.69% <0.00%> (-3.85%)	⬇️
packages/generators/src/types/index.ts	100.00% <0.00%> (ø)
packages/generators/src/utils/recursive-parser.ts
packages/generators/src/utils/index.ts
packages/generators/init-template/package.json.js
packages/generators/src/utils/validate.ts
...ckages/generators/src/utils/npm-packages-exists.ts
packages/generators/src/utils/run-prettier.ts
... and 19 more

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[rishabh3112]

Left a suggestion.

[webpack-bot]

@jamesgeorge007 Thanks for your update.

I labeled the Pull Request so reviewers will review it again.

@rishabh3112 Please review the new changes.