fix: helm repo add with flag --insecure-skip-server-verification. #3113

[mayzhang2000]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Optional. My organization is added to USERS.md.
• I've signed the CLA and my build is green (troubleshooting builds).

[codecov]

Codecov Report

Merging #3420 into master will increase coverage by 0.21%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##           master    #3420      +/-   ##
==========================================
+ Coverage   42.87%   43.09%   +0.21%     
==========================================
  Files         179      179              
  Lines       19899    19800      -99     
  Branches      272      272              
==========================================
  Hits         8532     8532              
+ Misses      10380    10281      -99     
  Partials      987      987              

Impacted Files	Coverage Δ
pkg/apis/application/v1alpha1/types.go	61.99% <0.00%> (-0.08%)	⬇️
util/helm/client.go	57.37% <100.00%> (ø)
cmd/argocd/commands/projectwindows.go	0.00% <0.00%> (ø)

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[mayzhang2000]

close #3113