fix: Enable helm OCI to work for lots of different URLs without having to create a repo for each one

[mayzhang2000]

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fixes: #5920

This PR is based on #6003.

Instead of creating a repo for each dependent helm oci URL, user can
argocd repocreds add localhost:5000/myrepo --enable-oci --type helm

[codecov]

Codecov Report

Merging #6027 (0b34f90) into master (70d7f2b) will decrease coverage by 0.03%.
The diff coverage is 21.95%.

@@            Coverage Diff             @@
##           master    #6027      +/-   ##
==========================================
- Coverage   40.97%   40.94%   -0.04%     
==========================================
  Files         147      147              
  Lines       19691    19725      +34     
==========================================
+ Hits         8069     8076       +7     
- Misses      10518    10538      +20     
- Partials     1104     1111       +7     

Impacted Files	Coverage Δ
cmd/argocd/commands/repocreds.go	0.00% <0.00%> (ø)
pkg/apis/application/v1alpha1/types.go	57.44% <ø> (ø)
server/application/application.go	30.72% <0.00%> (+0.03%)	⬆️
util/db/db.go	84.61% <ø> (ø)
util/settings/settings.go	41.46% <ø> (ø)
reposerver/repository/repository.go	60.71% <7.14%> (-0.95%)	⬇️
util/db/repository.go	62.50% <23.07%> (-1.67%)	⬇️
controller/state.go	68.95% <50.00%> (-0.20%)	⬇️
util/argo/argo.go	61.84% <60.00%> (-0.16%)	⬇️
... and 1 more

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[alexmt]

LGTM

[mballoni]

Good day fellows!

Is it also expected to work with chart dependencies from OCI repositories?