chore(controller): add UT for K8S related code

[anda-ren]

Description

Modules

• UI
• Controller
• Agent
• Client
• Python-SDK
• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

Merging #1216 (6a402fd) into main (48d946e) will decrease coverage by 12.74%.
The diff coverage is 55.55%.

@@              Coverage Diff              @@
##               main    #1216       +/-   ##
=============================================
- Coverage     68.87%   56.13%   -12.75%     
- Complexity     1071     1089       +18     
=============================================
  Files           292      231       -61     
  Lines         13109     6178     -6931     
  Branches        636      641        +5     
=============================================
- Hits           9029     3468     -5561     
+ Misses         3895     2512     -1383     
- Partials        185      198       +13     

Flag	Coverage Δ
controller	56.13% <55.55%> (+1.03%)	⬆️
standalone	?
unittests	?

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

Impacted Files	Coverage Δ
.../starwhale/mlops/schedule/k8s/K8sClientConfig.java	0.00% <0.00%> (ø)
...starwhale/mlops/schedule/k8s/NodeEventHandler.java	78.94% <66.66%> (+78.94%)	⬆️
...ava/ai/starwhale/mlops/schedule/k8s/K8sClient.java	72.41% <100.00%> (+69.02%)	⬆️
client/starwhale/api/job.py
client/starwhale/api/_impl/dataset/builder.py
client/starwhale/utils/log.py
client/starwhale/utils/debug.py
client/starwhale/core/instance/view.py
client/starwhale/base/type.py
client/starwhale/utils/retry.py
... and 58 more

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[dreamlandliu]

lgtm