refactor(typescript-estree): simplify applyModifiersToResult

[armano2]

Those changes has been extracted from #3078

simplifies logic used to generate deprecated modifiers field in some of nodes. instead of iterating over nodes collecting results, filtering them and mapping them again we perform entire operation in first loop

this change has negligible perf improvement

[typescript-eslint]

Thanks for the PR, @armano2!

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[codecov]

Codecov Report

Merging #3084 (81dfe13) into master (763a252) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3084      +/-   ##
==========================================
- Coverage   92.83%   92.83%   -0.01%     
==========================================
  Files         314      314              
  Lines       10675    10671       -4     
  Branches     3027     3027              
==========================================
- Hits         9910     9906       -4     
  Misses        348      348              
  Partials      417      417              

Flag	Coverage Δ
unittest	92.83% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/typescript-estree/src/convert.ts	98.36% <100.00%> (-0.01%)	⬇️