Fix: fail to get global helm config secret

[chivalryq]

Signed-off-by: Qiaozp qiaozhongpei.qzp@alibaba-inc.com

Description of your changes

The logic in GetConfig interface will return extract auth info from secret error when the configured helm repo is from global config.

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

Patch coverage: 83.87% and project coverage change: -0.66% ⚠️

Comparison is base (3978079) 59.05% compared to head (96e3596) 58.39%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #867      +/-   ##
==========================================
- Coverage   59.05%   58.39%   -0.66%     
==========================================
  Files         114      115       +1     
  Lines       19795    20039     +244     
==========================================
+ Hits        11690    11702      +12     
- Misses       6674     6901     +227     
- Partials     1431     1436       +5     

Flag	Coverage Δ
apiserver-unittests	31.87% <67.74%> (-0.30%)	⬇️
server-e2e-tests	47.81% <58.06%> (-0.67%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
pkg/server/domain/service/helm.go	49.60% <66.66%> (+0.39%)	⬆️
pkg/server/domain/service/config.go	64.06% <85.71%> (+1.66%)	⬆️

... and 13 files with indirect coverage changes

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