fix bug to download chart from registry

[willzgli]

Signed-off-by: willzgli willzgli@tencent.com

fix bug to downlaod a chart from registry

What type of PR is this?
kind/bug

What this PR does / why we need it:
download chart from the registry and install it in child clusters

Which issue(s) this PR fixes:
Fixes #256 #244

Special notes for your reviewer:

[codecov-commenter]

Codecov Report

Merging #257 (cdc54c4) into main (e5930fa) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
- Coverage   10.43%   10.41%   -0.03%     
==========================================
  Files          39       39              
  Lines        4302     4311       +9     
==========================================
  Hits          449      449              
- Misses       3821     3830       +9     
  Partials       32       32              

Impacted Files	Coverage Δ
...ithub.com/clusternet/clusternet/pkg/utils/chart.go	0.00% <0.00%> (ø)

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