Use fetch with caching to download swagger definition

[dgolovin]

This PR fixes #2297.

Signed-off-by: Denis Golovin [email protected]

[codecov]

Codecov Report

Merging #2298 (cc87209) into master (30453ed) will increase coverage by 0.12%.
The diff coverage is 36.36%.

❗ Current head cc87209 differs from pull request most recent head c281051. Consider uploading reports for the commit c281051 to get more accurate results

@@            Coverage Diff             @@
##           master    #2298      +/-   ##
==========================================
+ Coverage   70.30%   70.42%   +0.12%     
==========================================
  Files          52       52              
  Lines        3421     3419       -2     
  Branches      630      629       -1     
==========================================
+ Hits         2405     2408       +3     
+ Misses       1016     1011       -5     

Impacted Files	Coverage Δ
src/k8s/csv.ts	14.43% <ø> (ø)
src/util/swagger.ts	41.17% <36.36%> (+20.12%)	⬆️

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