Fix the piped to correct invoking the k8s plugin

[Warashi]

What this PR does:

as title

Why we need it:

Without this PR, the pipedv1 cannot invoke the k8s plugin.

Which issue(s) this PR fixes:

Part of #4980

Does this PR introduce a user-facing change?: No

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 25.71%. Comparing base (4f1ff0f) to head (f51480a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/pipedv1/cmd/piped/piped.go	0.00%	1 Missing ⚠️
pkg/app/pipedv1/plugin/kubernetes/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5401      +/-   ##
==========================================
- Coverage   25.73%   25.71%   -0.03%     
==========================================
  Files         449      449              
  Lines       48452    48452              
==========================================
- Hits        12470    12460      -10     
- Misses      35008    35020      +12     
+ Partials      974      972       -2     

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