feat: support to set helm repo url by config or environment

[ldming]

• resolve [Improvement] cli support to set default helm chart repo #3900
• support environment variable HELM_REPO_URL to set default helm repo url
• support config key helm_repo_url for config file to set default helm repo url

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.10 ⚠️

Comparison is base (85a667e) 68.48% compared to head (1b2f69e) 68.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3905      +/-   ##
==========================================
- Coverage   68.48%   68.38%   -0.10%     
==========================================
  Files         220      220              
  Lines       23724    23724              
==========================================
- Hits        16247    16224      -23     
- Misses       6013     6030      +17     
- Partials     1464     1470       +6     

Flag	Coverage Δ
unittests	68.38% <ø> (-0.10%)	⬇️

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see 7 files with indirect coverage changes

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