refactor: remove redundant type & fix nested template literals

[noritaka1166]

What kind of change does this PR introduce?
refactoring

Did you add tests for your changes?
no

If relevant, did you update the documentation?
no

Summary

• remove redundant type
• fix nested template literals

Does this PR introduce a breaking change?
no

Other information
no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.96%. Comparing base (31f634a) to head (7837031).
Report is 238 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4464      +/-   ##
==========================================
- Coverage   90.18%   89.96%   -0.23%     
==========================================
  Files          22        9      -13     
  Lines        1702     1415     -287     
  Branches      491      463      -28     
==========================================
- Hits         1535     1273     -262     
+ Misses        167      142      -25     

Files with missing lines	Coverage Δ
packages/webpack-cli/src/plugins/cli-plugin.ts	86.11% <100.00%> (ø)

... and 3 files with indirect coverage changes

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