Removed explicit type declarations

[Biki-das]

Explicit types where they can be easily inferred may add unnecessary verbosity for variables or parameters initialized to a number, string, or boolean, so this PR furthers remove it

[codecov-commenter]

Codecov Report

Merging #12038 (c4e8b06) into main (95f4969) will not change coverage.
The diff coverage is 91.66%.

@@           Coverage Diff           @@
##             main   #12038   +/-   ##
=======================================
  Coverage   68.77%   68.77%           
=======================================
  Files         324      324           
  Lines       16670    16670           
  Branches     4814     4814           
=======================================
  Hits        11465    11465           
  Misses       5172     5172           
  Partials       33       33           

Impacted Files	Coverage Δ
packages/expect/src/jestMatchersObject.ts	85.71% <0.00%> (ø)
packages/expect/src/asymmetricMatchers.ts	83.05% <100.00%> (ø)
packages/expect/src/matchers.ts	97.86% <100.00%> (ø)
packages/jest-cli/src/init/generateConfigFile.ts	96.96% <100.00%> (ø)
packages/jest-cli/src/init/index.ts	87.50% <100.00%> (ø)
packages/jest-config/src/index.ts	20.00% <100.00%> (ø)
packages/jest-config/src/normalize.ts	89.11% <100.00%> (ø)

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[Biki-das]

@SimenB could you review this when you get some time?

[SimenB]

thanks!

[github-actions]

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