Remove PromiseKit from TranslationService

[codecov-commenter]

Codecov Report

Merging #466 (a9266e2) into main (c7d63b3) will increase coverage by 0.12%. The diff coverage is 94.87%.

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@@            Coverage Diff             @@
##             main     #466      +/-   ##
==========================================
+ Coverage   86.45%   86.57%   +0.12%     
==========================================
  Files         190      190              
  Lines        7089     7064      -25     
==========================================
- Hits         6129     6116      -13     
+ Misses        960      948      -12     

Impacted Files	Coverage Δ
...urces/BatchDownloader/Network/NetworkManager.swift	83.33% <ø> (-5.13%)	:arrow_down:
...anTextKit/Search/Searchers/CompositeSearcher.swift	80.48% <ø> (ø)
...TextKit/Search/Searchers/TranslationSearcher.swift	100.00% <ø> (ø)
...ranslationService/LocalTranslationsRetriever.swift	100.00% <ø> (+10.71%)	:arrow_up:
...ranslationService/TranslationsVersionUpdater.swift	97.29% <ø> (ø)
...es/Utilities/Extensions/PromiseKit+Extension.swift	46.66% <ø> (+18.66%)	:arrow_up:
...tionServiceTests/TranslationsRepositoryTests.swift	75.53% <66.66%> (+0.53%)	:arrow_up:
...oader/Downloader/DownloadBatchDataController.swift	94.23% <100.00%> (ø)
Sources/TestUtilities/Utils.swift	82.08% <100.00%> (-1.79%)	:arrow_down:
...ources/TranslationService/TranslationDeleter.swift	100.00% <100.00%> (ø)
... and 4 more