chore: fix check kb upgrade release status in 0.9

[yipeng1030]

move checking upgrade release status from cmd/kubeblocks/upgrade to helm/upgrade() and improve UT.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 6 lines in your changes missing coverage. Please review.

Project coverage is 42.77%. Comparing base (ade33b4) to head (eaa7d1b).

Files with missing lines	Patch %	Lines
pkg/util/helm/helm.go	71.42%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           release-0.9     #493   +/-   ##
============================================
  Coverage        42.77%   42.77%           
============================================
  Files              183      183           
  Lines            26064    26073    +9     
============================================
+ Hits             11149    11153    +4     
- Misses           13596    13600    +4     
- Partials          1319     1320    +1     

Flag	Coverage Δ
unittests	42.77% <71.42%> (+<0.01%)	⬆️

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